Sing one of Justin Beiber's most hated song in the middle of a large crowd of Beiber haters.
Run around screaming "I HACKED NASA!!!!" I did this once. People stared at me like I was freaking crazy.
Slam every door you come to/ leave it wide open.
Poke people in the eye and say you wanted to see what happened.
Dump a ton of nasal spray boxes into someone's shopping cart.
Stare at a large security camera and use it like a mirror as you pick your nose.
Dump oil on the floors while no one's looking.
Walk into the opposite gender's bathroom like it's perfectly normal. After a few moments, run out screaming with toilet paper wrapped around you.
Take eggs from the produce section of a store and throw them over the aisle, seeing how many people you can hit.
~EDIT FOR MORE~
Make camera noises when people are in awkward positions.
Walk backwards/sideways everywhere and if you bump into someone, blame it on them.
Say everything backwards.
Talk in opposites all day long.
Stay up all night and sleep all day.
Walk around with your shoelaces tied together and act like nothing's wrong.
Put "Kick Me" notes all over your back, all signed by yourself.
Act like you're driving a car everywhere and "honk" at everyone.
When you're about to move out of the way of someone any know they are too, move the same way they are (purposefully blocking them) and act like it's all an accident. When the other person gives up, start crying and say "I'm so sorry!!!"
When the intercom comes on at school during an important message (best done if you're new to a school) scream "NOT THE VOICES AGAIN!!!!!" and run screaming that over and over or run out of the room and into all of the rooms you can while the message is going on screaming "not the voices".
I know these would mostly annoy people XD
