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" A: Look, if I argue with you, I must take up a contrary position. M: Yes, but that's not just saying 'No it isn't.' A: Yes it is! M: No it isn't! Argument is an intellectual process. Contradiction is just the automatic gainsaying of any statement the other person makes. (Short pause.) A: No it isn't." " A: Well, you didn't pay. M: Aha. If I didn't pay, why are you arguing? I got you! A: No you haven't. M: Yes I have. If you're arguing, I must have paid. A: Not necessarily. I could be arguing in my spare time."