One question about a joke is, how well is the strangeness of the situation resolved? At 'The New Yorker', we retain a lot of incongruity, tapping the playful part of the mind - Monty Python-type stuff. We also try to use humor as a vehicle for communicating ideas. Not editorial comment, but observation.
There's public humor, and there's private humor, and they're all appropriate in their own way, and you shouldn't - just as you wouldn't have a megaphone and say certain things that you would say around your friends - things that are perfectly all right within your close social group with whom you share a certain context.