I know they tell you "Never hit a man with a closed fist", but it is, on occasion, hilarious.
Captain Malcolm Reynolds, Firefly

Sue: What happenned to your knuckles anyway?

Walt: Oh... I slipped in the shower. No big problem.
In a fight, you have to be careful not to break the little bones in your hand on someone's face. That's why I like bathrooms... lots of hard surfaces.
Michael Westen, Burn Notice