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Themise
I play pranks on my friends almost 24/7 at school. So many I can't remember them all.
If your friend wears glasses, steal them, zip tie them and hand it back. (I used a combination lock.)
Or do it to their backpack.
Roast them like crazy about pretty much anything they do. (I have a story for this one too but its kinda long. If you want to hear it, feel free to pm me.)
Water balloon filled with something not water. (I stuffed in confetti and popped it over my friends head.)
"hug me" notes on their back. (hug me, say hi to me, be my best friend)
If your going somewhere, tell everyone its your friends birthday. (I held a poster at the door before class telling everyone to sing happy birthday when the bell rang. It was actually their bday.)
Pretend you forgot their name. Do it multiple times throughout the day. (works best on people you kinda know. I did this to a girl a grade higher than me for 3 weeks. Drove her crazy in a amused exasperated way.)
Just make random comments on random things.
Say you feel sick and walk around the room in a confused way. (I haven't done this as a prank before.)
Hide food coloring inside food. (I did this with chocolate. Turned my friend (3 grades above me) mouth dark blue.)
Go to the bathroom and stay there for a long time, occasionally making weird noises. (Haven't done this before either.)
Download an app for a very high pitched noise and play it. (A classmate did this in science every day last year. Made the teacher go nuts, she had the electrician and plumber come in. And she never figured out the source of the noise.)
Just laugh like crazy and start fake hyperventilating. (What I do to get rid of excess energy.)
Give them an opaque box and evil smile. Somehow hint there's a creepy insect if they're afraid of insects in there. (I do this a lot with this annoying person in 2 of my classes. Sometimes there actually is an insect. Other times, its just an empty box.)
I've got some more but some are hard to do if your at home. Some require some preparation. And some I just can't remember if I'm not in the mood.