One time we got around the security for a shared windows folder (Win98). Another time a couple of us printed fake midterms for ourselves on official headered paper. But the one that sticks out is this trojan program I got from my older brother called deepthroat. I put it on a couple of other people's computers that I wanted to mess with, and proceeded to open their cd tray, pop up fake warnings/errors, and other random stuff that a friend and I thought was hilarious at the time. It all stopped when I popped up a message that said "Contacting [name]'s parents..." on this girls computer and she got the teacher's attention about it. He knew what was up and scanned all the computers. He was mad but we didn't really get in trouble. We also did the fake desktop screenshot stuff :D