Heathcliff blows a duck call, which prompts a bunch of ducks to show up around the umpire at a ball game. The ump, realizing that he's umping before a crowd of freshly popped corn, becomes embarrassed. If Heathcliff continues to blow the duck call, he won't merely be ejected: He'll get the ump's spiky brass knuckles upside (inside?) his forehead.