My vote is for NBA coaches. Players never listen to them. All they really do is yell a bunch of cliches during timeouts and draw up plays that the players don't run.
I don't know how many times I've seen a coach draw up a play during a timeout, only to have a player dribble the ball for 20 seconds and throw up a prayer from 25 feet.
Ever see one of those mic'd up timeouts? The players arent evem paying attention to the coach at all. I'm pretty sure I could scribble a bunch of shit down on a little white board, then stand up, clap my hands and yell some cliche like , "Ok guys let's hustle and play smart basketball. "