1) Go around singing the Hogwarts school song at the top of your lungs.

2) Throw a sock at someone, and when they hand it back to you say, "Master has given Dobby a sock. Dobby is free!"

3) Recite the golden egg poem whenever someone loses something.

4) Sing the Ilvermorny song, including the animal sounds at the beginning, when someone says they hate school.

5) Sort everyone and address them by their house instead of their name.

6) Assign everyone a patronus and put the animal on all of their things.

7) Bring your wand to school and use silencio when people won't shut up.

8) Sneak up behind someone and yell, "CONSTANT VIGILANCE!!!" at the top of your lungs. Bonus points if you jump on their back, or something to that affect.

9) Cut the lunch line and, when you're told to wait your turn say, "I did my waiting! Twelve years of it! IN AZKABAN!!!"

10) Make everyone address you as your favorite character.

11) Refer to fanfiction as if it were cannon to confuse people who didn't read the books or watch the movies.

12) Give couples ship names based on which couples from Harry Potter they are like. (Ex. Romione, Hinny, etc.)

13) Say "Nox" when the teacher asks you to turn off the lights.

14) Say "Lumos" when the teacher asks you to turn the lights back on. 

15) Ask your friends for chocolate frogs instead of Hershey's.

16) Write Harry Potter quotes down and leave them everywhere. EVERYWHERE. (Ex. "You're just as sane as I am." "Nitwit. Blubber. Oddment. Tweak." "No need to call me, 'Sir', Professor." "Why is it always me?" "I expect nargles are behind it." etc.)

17) Force your friends to play Wizard's Chess with you, and call out the moves before moving the pieces. 

18) Start a petition to create a muggle quidditch team.

19) Whenever someone you don't like intrudes on your conversation, whisper, "Kill the spare."

20) Bring a toad and a chicken egg to school and say you're trying to hatch a basilisk and your house is to warm.

21) Talk to your friends in parseltongue. (Google Parseltongue Dictionary and clink on the first thing that pops up.)

22) Make fake potions and give them to people for your science fair project and say you're testing the Placebo Affect.

23) Put a bookmark on page 394 in every book you can find.

24) Talk in a British accent all day. Unless your British, in which case, talk in an American accent and say you're from Ilvermorny.

25) Make unbreakable vows instead of Pinkie Promises. 

26) Call your teachers by their Hogwarts counterpart. 

28) Give Harry Potter related gifts at every holiday, even ones that no one even knows exist. (Ex. February 18 is National Battery Day. Give out batteries and say that you found them in your collection of plugs.)

29) Use wizard slang.

30) Set up an account on every Harry Potter site you can think of for all of your friends. And then force them to interact with you.

31) Make your friends have a Harry Potter movie marathon with you and then make them take a quiz to make sure they were paying attention.

32) Make all of your friends wands and force them to duel with you.

33) Spend all day acting like you're a witch or wizard at Hogwarts.

34) Read The Tales of Beedle and the Bard out loud during a break or lunch.

35) Force people to help you make butterbeer.

36) Make people read your fanfiction and give you constructive criticism. 

37) Bring a stuffed cat, owl, or toad to school and fix it so it sits on your shoulder all day. (Unless it will get you in trouble.)

38) Bring your lunch one day and make it Harry Potter inspired food. (Ex. Chicken Pot Pie is Shepherd's Pie, a chocolate cupcake is a cauldron cake, etc.)

39) Whistle Hedwig's Theme at lunch, during break, in between classes, while waiting for your ride, while on the bus, pretty much everywhere you won't get in trouble.

40) Steal their phones and change all the names in their contacts to Harry Potter characters.

41) On someone's phone who doesn't know Harry Potter characters, make yourself Umbridge, call them, and if they tell you you're Umbridge, act offended and refuse talk to them for a week.

42) Get them a spider plant and name it Aragog. 

43) Assign them the names of Harry Potter characters and address them only by that name for as long as you want.

44) Whenever they call you, or you call them, pretend to be Ron when he used a phone for the first time.

45) On May 2nd, wear all black, act mournful, and fake cry whenever someone tries to talk to you.

46) Bring cupcakes to school whenever it's a character's birthday.

47) Draw a lightning bolt scar and glasses on someone's face if they fall asleep in class and the teacher is okay with you doing it. (DO NOT USE A PERMANENT MARKER!!!)

48) Put a removable Dark Mark sticker on all of their possessions and accuse them of being a Death Eater.

49) Randomly act like you're favorite series is Twilight, all of a sudden, just to confuse them.

50) Whenever they confront you about any of this, act like you don't know what Harry Potter is.