Quote from Kramer in The Scofflaw
Jerry: Hey, do you know what the whip does?
Kramer: What whip?
Jerry: The whip in the Senate, in the House.
Kramer: Well, you know in the old days, when the senators didn't vote the way that the party leaders wanted 'em to... they whipped them. "You better vote the way we want you to, or there's gonna be big trouble. [whip sound]"