Full Metal Jacket
Gunnery Sergeant Hartman: I am Gunnery Sergeant Hartman, your senior drill instructor. From now on you will speak only when spoken to, and the first and last words out of your filthy sewers will be sir. Do you maggots understand that?
Recruits: Sir, yes sir!
Gunnery Sergeant Hartman: Bullshit I can't hear you. Sound off like you got a pair.
Recruits: SIR, YES SIR!