Quote from Mindkiller (Ace, 1982) by Spider Robinson:
"If a person who indulges in gluttony is a glutton, and a person who commits a felony is a felon, then God is an iron."
Whether or not you believe that God indulges in irony -- though I would argue that the existence of platypus is strong supporting evidence to the claim -- this is some pretty sweet wordplay. So let's take a look under the linguistic hood and see how it works.