My favourite is when cdesign proponentsists try to argue that ID/cretinism is just as scientific as evolution, so it's unfair and biased to keep it out of science classes. Then without pausing for breath, they moan that evolution is a religion just like ID/cretinism, so it's unconstitutional to teach it in science classes. They want to carry tea and no tea at the same time (bonus points if you get the reference - hint: DNA).
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'