Mr. Vibrating: I'm very sorry, but I'm not allowed to argue unless you've paid.
Man: Aha! If I didn't pay, then why are you arguing? Got you!
Mr. Vibrating: No you haven't.
Man: Yes I have. If you're still arguing, I must have paid.
Mr. Vibrating: Not necessarily. I could be arguing in my spare time.
Man: Oh, I've had enough of this!
Mr. Vibrating: No, you haven't.
Man: Oh, shut up!

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