Ralph: What's a battle?
Principal Skinner: Hahahaha, lets go.
Superintendent Chalmers: Did that boy say what's a battle?
Principal Skinner: No he said What's that rattle, it's about the heating duct.
Superintendent Chalmers: Hmm, it sounded like battle.
Principal Skinner: I've had a cold, so--
Superintendent Chalmers: Oh so you hear r's as b's?