Tony
You were checking yourself out in the door window that you thought was glass. First you went to see if you had anything in your teeth, then fixed your hair, and then gave your self a pep talk and to top it all off you started to make goofy faces. You then open the door and to your horror you see it wasn't a mirror after all. Tony, and the rest of the people attending the meeting were watching the entire time...

Steve
You were trying to get Bear to fetch the ball, he's always been stubborn about catching balls and he needed to do it if you were wanting to put him in the dog show next month. It was hopeless, you would throw the ball and yell, "Go get Bear! Fetch!" And he would just sit there. Within twenty minutes the game of fetch was finally played properly only it was you doing the fetching. Steve was watching the entire time but you didn't notice until you already were on all four with the ball in mouth about to drop it at Bear's feet.

Bruce
You two went to a fancy french resturaunt one night because it was its grand opening and you've never tried snails. It didn't go well though...you actually ended up choking because you swallowed the shell, it came up though... right onto Bruce's plate.

Pietro
You were out riding you bike on a trail when he saw you and excitedly zoomed up to you, "Boo!" He screamed. Of course you did what anyone would do, you pressed the brakes as you swiveled to the side. Only you forgot the the handle brakes were broken so the swivel actually turned into a turn and you fell off the trail down the steep hill where you then fell off the bike hit a log and as a finale you face planted in mud.

Bucky
You were supposed to be writing a report for SHIELD about your latest mission but you got bored and turned on your mental soundtrack instead. Your head started to bob to the imaginary beat and when you hit the chorus you jumped on your desk and began punching the air while sing the Eye of the Tiger. Then you started to dance and then heard someone laughing, "Hah beautiful work sweatheart." You yelped and fell off the desk and landed straight on your back, knocking the wind from you. He leaned against the doorframe, "So, how's that report going?"

Thor
One day you went on a walk with him, you had fun but felt like something important was missing, that you forgot something. That day he couldn't seem to focus on your eyes. Once you got home though you looked in the mirror and almost punched yourself in embarrassment. You forgot your bra...

Clint
You guys are pranksters. You don't live a day without embarrassment. Like the time he wore a Babadook mask and jumped out of the storage closet causing you to fall down the stairs. That was at Clint's family reunion...

Loki

Loki is a shape shifter for crying out loud! He loves to shift as a cat and you happen to do a LOT of embarrassing things around cats. Once you got them you get crazy, as in shake the all around screaming nonsense crazy. And you know those "kisses" you give kittens but its really just you sticking their head in your mouth...yeah. But hey, what can ya say? You love cats...