We'd play Quake 2 Evolved and our teacher would tell us to stop, threatening us with office referrals and detention.
Once a few of us were playing and when the teacher would get close we'd start coughing, to let the others know we had to get it off the screen. Well I heard the coughing but completely forgot what it meant and I got busted. The funny thing is, the dude two seats away from me apparently forgot too and she caught him and was like "Didn't you hear what I just told him? NO PLAYING THAT GAME!" He was like "Oh sorry miss, I forgot."
It was pretty funny. It was always Q2E and SNES and Genesis roms.
EDIT: The more I watch the link I posted, the more I realize that kid is just like me. He gets pissed and like yells, then starts talking normally like nothing happened. Then he blames his suckiness on the weapon, saying it's not doing what it's supposed to do.
I can't think of a time where I've actually broken a game or anything though.