Earlier in the game, the ump blew (and I mean really blew) a call at home plate. He called the Cubs runner out when he was clearly safe. I don't think he was doing that great of a job on balls and strikes either. Anyway, Mongo gets up to sing, and before the music starts says something like "Don't worry, I'm gonna have a talk with that home plate umpire after the game!" Hernandez did the "you're out of the game" gesture, and Mongo was ejected from the stadium. But damn, was it funny.