A cop walks down a street, when suddenly the doors of a building fly open and out comes a kid running at full speed, chased by another guy right behind him. At the next corner, the guy grabs the kid, throws him on the ground and starts beating the crap out of him. The cop breaks them up, and asks, what on earth is the matter? "Officer, you gotta understand", replies the guy, "I'm a bass player." "Uh-huh", says the cop, "so?" "So I'm playing in the club over there, we're in the middle of a tune, when this kid comes walking up to the stage, reaches right up to my bass, and detunes one of my strings." "So?" "Officer! The little punk won't tell me WHICH ONE!!"