The website WorldStarHipHop seems to exclusively feature videos of people fighting. But there's a new one that's actually pretty good. A guy on the boardwalk in Atlantic City tries to start a fight with another guy, who does his best NOT to get in a fight.
But when the first guy takes a swing at him, he dodges it and then knocks him out with ONE PUNCH. (Search for "When Acting Hard Goes Wrong - Atlantic City." He dodges the punch at :28. WARNING: There's an F-bomb at the very end.)