Was reading an article today, and came across this winner. I've hidden stuff that might be upsetting, so read at your own risk.
A worker, for a $100 bet, offered to use a staple gun to affix his, er, most sensitive appendage to a wooden plank. He performed this in his company's lunchroom. As the report said, "through the miracle of modern technology, this was recorded." The resulting video was then posted for public viewing on a website. Worker was shocked and appalled when his company then discharged him for unsafe behaviour in the workplace.
At least he only hurt himself. Another worker, in the same article, believed his nail gun wasn't working, and to prove it pressed it against the stomach of a co-worker and pulled the trigger. Unfortunately for the co-worker, it was working after all.