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?
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
Shaw: Remember, the aim shouldn't be to hurt him, just incapacitate him a little. Also, watch your knuckles. I've punched a lot of guys.
Carter: [knocking out Laskey] So have I.
— Person of Interest, "The Perfect Mark"
"I can keep this up all day. Tell the Commander what he wants to know. (punches prisoner, then shakes his hand in pain) Maybe I can't keep this up all day."
— Harry Kim, Star Trek: Voyager, "Living Witness"