Ok, since this has gone a bit more toward jokes and personal experiances, I have some more. Some of these happened to me, some to my friends.
When your chemistry teacher tells you to put on goggles, PUT THEM ON!
Don't chug a bottle of bubble mix on a dare.
DO NOT put a whole sachet of popping candy in your mouth and then drink really fizzy soda afterwards. It sure is funny.....but your stomach will never forgive you for it
If you wake up at three a.m. sit down to pee. It may make you feel like less of a man but your floor won't smell like piss for a month.
Don't let 12 year olds get near energy drinks.
Don't throw frozen crabcakes straight onto the boiling vegtable oil. ( just trust me on that)
Do not play with microwaves.
Those liquid ice things? NEVER, under ANY circumstances, squeeze one to use in place of eyedrops. It burns like holy hell....
Don't cut jalapenos or any kind of hot peper and then pick your nose.
Don't fall asleep with one of those icebreaker mints in your mouth, also, don't eat a container of them at once.
Don't eat a banana then chug a 7up.
Do not sit down without making sure there is toilet paper.
I suggest that you refrain from giving the finger to anyone that looks surprised when you come out of an R rated movie (If you're underage). That person may well be the usher's girlfriend.
This got one of my friends banned from a theater.
Never get food from a refridgerator while naked. Things get caught in the doors that should never get caught.