Dirk Gently's Holistic Detective Agency:

Electric Monks are devices designed expressly to believe things, thus saving their owners the trouble of doing so. One such electric monk on a 'faraway alien planet' began to suffer severe malfunctions in its belief system and cycled through a series of ever more ridiculous beliefs. Due to these malfunctions, it was ejected from civilisation with only a horse, as horses are rather cheap to produce. It currently believes that its surroundings are a particular shade of pale pink and that an otherwise ordinary white door in the side of a cliff leads into a strange, new world. (paraphrased from wikipedia) One of its many ponderings -

He believed in a door. He must find that door. The door was the way to... to... The Door was The Way. Good. Capital letters were always the best way of dealing with things you didn't have a good answer to.

"I refuse to prove that I exist," says God, "for proof denies faith and without faith I am nothing."

"But," says Man, "the Babel fish is a dead giveaway isn't it? It could not have evolved by chance. It proves that you exist, and so therefore, by your own arguments, you don't. Q.E.D."

"Oh dear," says God, "I hadn't thought of that," and promptly vanishes in a puff of logic.

"Oh, that was easy," says Man, and for an encore goes on to prove that black is white and gets himself killed on the next zebra crossing. Most leading theologians claim that this argument is a load of dingo's kidneys, but that didn't stop Oolon Colluphid making a small fortune when he used it as the central theme of his best-selling book, Well That About Wraps It Up For God.