I think the humor of double puns is incredible.
I say 'as it were' or 'so to speak' too often because puns and double entendres keep insinuating themselves into my consciousness as I'm talking.
Metaphors, similes, puns - all manner of metonymy - I'm interested in language that cannot be parsed by a machine - language that can only be understood through acculturation.
People who make puns are like wanton boys that put coppers on the railroad tracks. They amuse themselves and other children, but their little trick may upset a freight train of conversation for the sake of a battered witticism.