It's strange that the topic above this one is about anger and violence in the workplace considering that most of the fights that I've witnessed started out as horse-play.
One in particular that I remember from my underground coal miner days happened in the shower room when one guy was pouring soap on another guys head as he was trying to rinse the shampoo out of his hair. They got into a pretty serious fist fight right in the shower room. It was hard not to laugh at the sight of two grown naked soapy men fighting. They were lucky that no one from management witnessed the fight or they would been clean but jobless.