(Y/n), Mordecai and Rigby are standing in front of a burger truck. "Aw, yeah-uh, burgers for lunch!" Rigby said. "You get the portabella mushroom burger?" Mordecai asked. "You porto better believe it." "Ooohhhhhh!!!!" The trio said. "Order up." Gimelli said. "Yeah, yeah, yeah!" The trio said. They get their burgers. "Aw, yeah, this is gonna be good!" Rigby said. "Yeah, but I feel like we're forgetting something." Mordecai said.

"(Y/N), MORDECAI AND RIGBY, YOU FORGOT TO FILL THAT POTHOLE!" Benson points at a small pothole next to the burger truck's wheel. "Oh, yeah, that thing. Well, see, I think we'll work better if we take a quick snack break." (Y/n) said. "Look, we promise to do it right after." Rigby said. "NO! NO BURGERS! JUST FILL THE POTHOLE OR YOU'RE FIRED!" He walks away. "Classic Benson." (Y/n) said.

"Dudes, just one bite?" Mordecai  asked. "There's nothing on Earth that's gonna stop me from eating this burger." Rigby said. As they are about to eat, they see an anonymous object falling out of the sky and landing near the food truck, creating a larger hole. "Why am I not surprised?" (Y/n) asked. "Aw, man! Now the pothole's way bigger!" Mordecai said. They walk towards it and see an egg shaped spacecraft in the hole.

"Wooooooooaaaaahhh" the trio said. "Dudes, come on." (Y/n) said. They run towards it. Mordecai touches it and it slowly opens. "AH!" They shouted. The trio move towards the opening, but Confetti shoots out. "AAAHH!" The trio screams. A passed out horse is seen with a few empty soda cans. "What the-AH!" Rigby said. The horse falls out of the spacecraft. The horse slowly wakes up in the house and sees (Y/n), Mordecai and Rigby standing there.

"Dudes, he's waking up." Rigby said. "What..what's going on? Who are you guys?" The horse asked. "We're (Y/n), Mordecai and Rigby, who are you?" Mordecai asked. "I'm Party Horse, and I like to paaaaaaaarrrrrrrtay! So, hey, uh, where am I?" He asked. "You're on Earth, dude." (Y/n) said. "Earth?! Wait, what country is this?!" The horse asked. "USA, man! Land of the free, home of the brave!" Rigby said.

"Well, somebody's patriotic." (Y/n) joked, and Rigby glares at her. "Ha ha." He said sarcastically. The horse gasps. He looks around and sees American objects, like a small Statue of Liberty, a book with Uncle Sam on the cover that states "I Want You To Save Big, All American Carpet,"  and a picture on the wall of George Washington. Party Horse starts to freak out. "AAHH! I REMEMBER NOW. AAHH!" He kicks the picture, causing it to fall down and break. "Dude!" (Y/n) scolded.

"Aww, man! Benson just hung that up!" Mordecai shouted. "I'm sorry! It's just, ugh, U.S. history is a touchy subject for me." Party Horse said. "Woah, they have U.S. history where you're from?" Rigby asked. "Yeah, that's why I'm here in the first place....Back on Party Horse Planet, partying wasn't just a hobby, it was a way of life." In a flashback,  Party Horse 42699 parties in a club with other Party Horses. "WOOOOOOHH!!" "Everyone partied nonstop, day and night, around the clock. It was the best, man." Party Horse 42699 is partying while doing daily activities, such as taking a shower, flipping food in the kitchen, and sleeping. "Until, we had to go to school." A group of Party Horses are now in class,

including Party Horse 42699. "AAAAUUUUUGGHH!" He then plays with his mouth out of boredom. "They said, like, in order to become legit Party Horses, we had to pass a U.S. history test." He said. "Party's over, because Professor Party Horse is out partying, I'm gonna have to give you this test." The principal said. Party Horse 42699 flips through pages in the test and sighs.

"UUUUUUGGGHHH!" He grabs his head, then raises his hoof. "Principal Party Horse?! Sir?!" He asked. "What is it, Party Horse 42699?" He replied. "Can I go to the bathroom? I promise I'll come right back, and take this test." Party Horse 42699 said. "Promise?" Principal Party Horse asked. Party Horse 42699 smiles. "Promise." Party Horse narrates again. "And then I totally BAILED!" Party Horse is now in his spacecraft, partying and drinking a soda. He finishes the soda and smashes the can with his head. "WOOOOOHH!!" The spacecraft disappears.

~Present~

"Bottom line guys, if I don't pass the U.S. history test, I'll never be able to party again." He said. "Whoa, that's rough, dude." (Y/n) said. "I still don't get why they have U.S. history on another planet!" Rigby said. "It's typical school, man. They don't even know! So, you guys think you could, like, help me study or somethin?" Party Horse 42699 asked. "Party Horse, we'll help you pass that test, because we've always wanted to help an alien pass a U.S. history test." Mordecai said, and Rigby nods. "Yeah, ever since we saw that one movie with the alien in it." He said. "We'll totally help you, dude." (Y/n) said. "WOOOOHH! ALRIIIIGHT!" He starts partying. The quartet is on the computer in the house. "Ok....what's a good history topic?" Mordecai asked.

"Um.......presidents!" Rigby said. "Ah, good one." Mordecai types. "Preeesiiident." He aaid. "....ooof parrrtyyying." Party Horse 42699 said, also typing. "I don't think that's a real topic, Party Horse." (Y/n) said. "No, no, just give it a second." The computer screen turns into a distracting page with icons partying, including a baby. "Woah! That dancing baby knows how to party." He starts partying, and (Y/n) face palms. Mordecai looks at Rigby and (Y/n). "Uh, maybe the internet's too distracting." He said. "Ya think?" (Y/n) asked. Later, the four walk into the library. "Ok, let's find the history section." (Y/n) said. Party Horse 42699 notices a librarian using a scanner and scanning books. He runs over to him. Mordecai notices Party Horse running off.

"Huh?" He asked. Party Horse 42699 grabs the scanner and flashes it around and starts to party again. "Nts, nts, nts, nts, AH, AH, nts, nts, nts!" He said. "I'd never thought I'd say this, but maybe the library is too distracting." Rigby said, and (Y/n) snickers. At an open field, Party Horse looks around, getting bored. He sees a tumbleweed fly by. "Um, guys," he sighs. "I'm worried it's gonna be really hard to throw a party out here, 'cause it's so boring." He said. "That's the idea, Party Horse. Now, let's study already." (Y/n) said. "Yeah, you're the one who asked us for help." Rigby said. The trio drop books at Party Horse's hooves.

Party Horse 42699 takes one of the books and opens it. He looks at it, then starts complaining, while frantically flipping the pages. "UUUGGHHHHHHAAAAAAGGGGHH!" "Oh what now?" (Y/n) asked impatiently. Party Horse slams the book closed. "LOOK. Guys. I'm gonna be real with you. I appreciate what you're doing, but I think I'll study better, if I just take a quick snack break." He said.

"Oh, come on! That's the lamest excuse in the book, Party Horse!" Mordecai shouted. "Yeah, I don't even use that one anymore very often!" Rigby said. (Y/n) looks at them in disbelief. "Oh really?" She asked. The duo chuckle nervously. Party Horse raises an eyebrow at them. "What's she getting at?" He asked. "Nothing!" Rigby snapped. "Look," Party Horse puts one hoof over his heart and the other in the air. "I promise that if we go eat something,

I'll study right after......right after." He said. "You promise?" Mordecai asked skeptically. "Oh wow, the irony." (Y/n) chuckled. "Promise." He said. Later the four are on the couch in the park house, playing video games and eating grilled cheese sandwiches. "WOH! Now this is a snack break!" Party Horse said. "Ok, we're done, now we gotta study." (Y/n) said. "AWWW COME ON, just ONE more round!" Party Horse said. "What?! No way! You said that the last four times!" (Y/n) shouted. "Yeah! No more distractions Party Horse!" Mordecai shouted.

"Yeah, nothing on Earth is gonna keep you from studying for that test!" Rigby shouted. At that moment, another spacecraft can be heard crash landing outside of the house, which causes some shaking. The three go to the window and look outside. They see another giant hole created outside of the house, with the spacecraft peeking out. "Man, I've gotta stop saying that!" Rigby said. "Yes, yes you do." (Y/n) agreed.

"He found me. I don't know how, but he found me!" Party Horse shouted. "What?! Who found you?" Mordecai asked. The spacecraft is now slowly opening, and Principal Party Horse steps out. "The principal I'm guessing?" (Y/n) asked. "Yes!" Party Horse shouted. Principal Party Horse walks out of the hole, carrying an air horn. He takes off his sunglasses and speaks into it. "Party Horse! I know you're in there. Come out right now and take that U.S. history test." He said.

"I'll take it when I want, which is never old man!" Party Horse blows a party whistle. "If you don't come out and take that test right now, I'm gonna blow up the earth with this detonator!" Principal Party Horse pulls out the detonator, and it starts beeping. "WOAH, WHAT?!" Mordecai asked. "You can't do that!" (Y/n) shouted angrily. "Can he?!" Rigby asked. ".....yeah..." Party Horse said. "Now if you don't come out on the count of three, your party is gonna end with a BANG! 1....." Principal Party Horse said.

"UuuuuUUUUUUUHH...." (Y/n), Mordecai, Rigby, and Party Horse said. Principal Party Horse can be heard in the back ground still counting, ".....2.........2 1/2.....") "oh come on, you're gonna count like that?" (Y/n) asked. "(Y/N)!" Everyone shouted scoldingly. "What? You want us to die quicker?!" Rigby asked. Mordecai then kicks the front door open and stops Principal Party Horse. "WAIT! Party Horse just isn't ready yet! He needs more time to study!" Mordecai shouted.

"He's had plenty of time!" Principal Party Horse said. "Yeah, but it's not his fault! We distracted him by getting him to play video games with us!" Mordecai said. "Yeah, that's it! Video games! Can't get enough of 'em here on Earth!" Rigby said, and (Y/n) slaps him. "Ow!" "Now you're the one who's not helping!" She shouted.

"Look, just give him one hour to study. Please." Mordecai said. "Alright, fine. One hour. But if he fails the U.S. history test, you'll ALL be history!" He puts sunglasses back on and stands on hind legs. "BWAHAHAHAHAHA!" He makes a soft neigh, then gallops away. "Oh yeah, good one." (Y/n) said sarcastically. "Aw man, thanks so much you guys." Party Horse said. "Listen Party Horse, partying's cool and all, but now the whole Earth's on the line." Mordecai said.

"You have GOT to study man!" Rigby said. "Yeah, DON'T let us down!" (Y/n) said. "No problemo, bros! I promise I'm gonna cram harder than I've ever crammed so I can pass that test to keep your planet from blowing up." Party Horse said. Back in the house, Party Horse flips a mixtape in a radio from "Party Mix" to "Teaching Montage Party Horse." Party Horse begins to study. In the kitchen, (Y/n), Mordecai and Rigby hand Party Horse a book. When he finishes reading it, they give him another book. Next Mordecai and (Y/n) tell him about George Washington and Rigby shows the same picture from before. Out of instinct, Party Horse kicks it again.

Then Party Horse reads about The Boston Tea Party, George Washington crossing to New Jersey, the Indians, the Statue of Liberty, the first trip to the moon in the 60's, Rosie the Riveter, the Heimlich blimp crashing, the Gothic painting, sailors coming home from WWII, the Dwight D. Eisenhower election, the Vietnam war, and Abraham Lincoln giving the Gettysburg Address. Finally, Party Horse closes the book and (Y/n), Mordecai and Rigby pat his back and nod. Party Horse is sitting at a desk and Principal Party Horse gives him his test.

"The U.S. history test consists of one hundred multiple choice questions. Fill in each circle completely with a number two pencil. You have one hour, and since I expect you to fail, I'm going to make an example of you," a camera is seen, in a classroom at Party Horse Planet, there is a room full of Party Horses watching. "So all the Party Horses back home will see what happens when you party without a proper grasp of U.S. history.""A different Party Horse is seen taking Party Horse 42699's spot." Back at Parkside Lux... "Good luck, Party Horse. The fate of this earth rests in your hooves." Principal Party Horse walks away and sits at a table. Party Horse looks nervously at the test. Principal Party Horse sets a timer. "Begin!" He said.

Party Horse 42699 begins the test, and starts to fill out the scantron sheet, question by question. He nods at some of them. "Hmm, hmm! He's got this." At that moment, Benson shows up. "What's going on here? Did you finish filling the pothole?" Benson notices Party Horse. "Why is there a horse taking a tes-MPH!" Mordecai puts his wing over Benson's mouth to shut him up. Then, he takes it off and explains the situation. "Look Benson, I know we normally don't have very good excuses for why we don't do stuff, but we definitely have a good one this time." He points at Party Horse. "That horse right there," he stops pointing.

"Fell out of the sky and has to pass a U.S. history test or the whole Earth is gonna explode." He said. "WHAT?!" Benson shouted. "SHH! Test taking IN PROGRESS!" Party Horse fills in question after question, until the graphite on his pencil snaps. (Y/n), Mordecai, Rigby, and Benson gasp. "OOOoooh, looks like you've been led astray. HAHAHAHA!" Principal Party Horse laughs. Party Horse 42699 looks down, feeling defeated. Principal Party Horse watches Party Horse, and has a hoof on the button on the detonator. "Hehehehe....."

(Y/n), Mordecai, Rigby, and Benson panic. "Uuuuhhh, UUUUHHHHHH, UUUUUHHHH!!!!!" Rigby notices a pencil sharpener on the wall across the room. "Look!" He starts to run towards it, but Principal Party Horse blocks his way. *NEIGH* Rigby runs around him and pulls the sharpener out of the wall, making a hole in the wall. "Aw come on! I JUST put that up!!" Benson shouted.

Rigby tries to run back, but Principal Party Horse is running towards him. "PARTY HORSE, CATCH!" Rigby throws it towards Party Horse and over Principal Party Horse. "NOOOOOOO! I DON'T WANT PARTY HORSE TO SUCCEEEEED!" Principal Party Horse shouted. Party Horse catches it. (Y/n), Mordecai, Rigby, and Benson gasp happily. "GRRRRR!" Principal Party Horse growled. Party Horse 42699 begins to sharpen his pencil, then finishes the last couple of questions.

The timer rings. "Pencils down!...Well, well, well, you're friends may have lead a horse do a U.S. history test, but let's see if they made him think. Now, give me that test." Principal Party Horse said. Party Horse 42699 gets up and walks over and hands the test over to Principal Party Horse. Before giving it to him however, Party Horse talks to him. "Principal Party Horse, I may have failed this test, but if I've learned one thing, it's that partying is an important part of U.S. history." He said. Principal Party Horse raises an eyebrow. "Go on..." he said. "Well, sir, it's a known fact that the biggest events in U.S. history were all about parties. The Boston Tea Party, the Two Party System, the other stuff that America has with parties. Think about it, man!

Look, I know I haven't been the best student, in the past, and you've been following me for a long time, and you've blown up a lot of planets because of me. But I'm done running away from my problems. Don't blame these guys for the stuff I did. They did their best to help me and it's not their fault that I am a non stop partying machine. That's on me! It's time I take responsibility for my actions, so please, no matter how I do on this test, promise me, you won't blow up the earth." Party Horse 42699 said. Principal Party Horse slowly claps.

"Responsibility! I've been waiting a long time to hear you say that, Party Horse. It's settled then. I promise not to blow up the earth, no matter how you did on this test." He said. Party Horse 42699 smiles and hands the test over. "Alright, I'll just take a look here and-" it's then revealed that Party Horse drew a picture of Principal Party Horse looking dumb and filled out the bubbles to spell out "Jerk Horse" instead of actually taking the test and he gets frustrated. "WHAT?!" He asked.

"Hahahahaha!" (Y/n), Mordecai and Rigby laughed. "Jerkhorse!" (Y/n) said mockingly. "PSYCH! No one's EVER gonna stop this Party Horse!" Party Horse does some flips and dances. "Nts, nts, nts, nts, AH, AH, nts, nts, nts, nts!" He moonwalks to the door. "4-2-6-9-9! 4-2-6-9-9!" Other Party Horses said. Party Horse 42699 continues to moonwalk all the way to his spacecraf

"Ah, ah, I'm like the top, of..." he backflips into the spacecraft. "HHUP!" Before closing the craft, he blows a party whistle. "Party Horse, AAAAAAOOUUUUUUUTT!" His spacecraft then leaves. "NOOOOOOO, PARTY HORSE! I never should've promised that I wouldn't blow up the earth regardless of the outcome of YOOOOOUUUUR TEESSSTTT!" He runs to his spacecraft and follows Party Horse. (Y/n), Mordecai, Rigby, and Benson stand at the entrance of the doorway for a moment. "Just please fill up the pothole." Benson said.