M: An argument isn’t just contradiction.

A: It can be.

M: No it can’t. An argument is a connected series of statements intended to establish a proposition.

A: No it isn’t.

M: Yes it is! It’s not just contradiction.

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! —The Argument Sketch [Monty Python]