uhm. i have a lot of these... i think one of the best ones was when i was 15 and a friend gave me some fake blood capsules that were left over from Halloween. we were walking past a Blockbuster Video, and he dared me to do something with them inside the store. So he hid out so he could still see in the store, and i went in, started to feign a coughing fit, while i had my mouth covered, i chomped the capsules, started to cough more, everyone was looking, and i coughed "blood" all over a rack of snack foods, fell down, and dragged myself out moaning and drooling of the store. everyone was shocked/horrified/disgusted, and as i was half out the door the manager came over to see if i was okay. i just got up and ran as fast as i could.
my friend and i nearly pissed ourselves laughing, and celebrated with some junk food from a nearby burger king. an hour later, a cop car pulled up next to us as we were walking a few blocks away.
"HEY. don't move you two."
i was honestly very scared. i had to deal with cops before, but this was the first time i was really in trouble. The cop got out of his car, explained the situation that the Blockbuster called the police about the incident. He searched us, but we were clean. he warned us to not fool around with things like that, and that we really scared the manager and some of the patrons. He told us that the manager has me on video, and that i wasn't allowed back into the store, if i did come in, he would call the cops. the cop let us go after taking our names and addresses.
this was the only blockbuster around me in walking distance, so i was upset, but i was still proud to some degree. i guess a week later, an older guy recognized me from the "bloodbuster" incident while walking down the street. "you're that blood kid from blockbuster!" i kind of got scared, but then he said "That was AWESOME". and then we talked about how everyone was stupid for getting scared when the blood didn't even look remotely real.
luckily, the Blockbuster got a new manager or something by the time the N64 came out, because i went in there and played the display model for hours because i couldn't afford to buy one.