This one happened to me in a baseball game, but it's so freakin' dumb I had to throw it in...
Runner on first base. Pitcher failed to come to a discernable stop in the set position and I yell, "That's a balk!". Pitcher then made about half a pitching motion and stopped before delivering the ball to the plate.
Base umpire points the runner to second base.
Offensive coach comes out with a question. He wants to know why his runner only got one base.
Huh? What do you mean, Coach. He got a one-base award because of the balk when the pitcher didn't stop.
Coach fires back, in all seriousness, "Yeah, but then he stopped his delivery to the plate. That's two balks. Shouldn't my runner get two bases?".