"I refuse to prove that I exist," says God, "for proof is against faith, and without faith I am nothing." "But," says man, "the Babel fish is surely an unconscious revelation, is it not? It could not have evolved by chance. It proves that you exist, and therefore you do not exist, according to your own argument. Quod erat demonstrandum." "Oh, my dear God," says God, "I hadn't thought of that," and promptly dissolves into a logic cloud. Brazenly stolen from The Hitchhiker's Guide To The Galaxy by Douglas Adams.
At Der Schockwellenreiter I found the original article.