The Knowledge: Part 1

I've seen a lot of this on the Internet.

Inverse proof by self-coprologisation:

A: "I claim such and such a thing."
B: "I don't agree, but I'm a piece of crap!"
C: "It's self-evident that you are not a piece of crap, therefore A is wrong and A must be a piece of crap."
B: "Thank you, C!"(with coprophagic grin).

Now you know how to win an argument on the 'net; and simultaneously call the other party a piece of crap without calling him a piece of crap.