Now it is such a bizarrely improbable coincidence that anything so mind-bog-gglingly useful could have evolved purely by chance that some thinkers have chosen to see it as the final and clinching proof of the non-existence of God. The argument goes something like this: `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 you exist and so therefore by your own arguments you don't. QED.' `Oh dear ' says God `I hadn't thought of that ' and promptly vanished 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.