An 8 year old walks into a bar and orders a scotch. The barmaid says "you're too young to be in here", takes the young man out of the bar and has him call his parents so they can come pick him up.
Anti-humor is a type of indirect humor that involves the joke-teller delivering something which is deliberately not funny, or lacking in intrinsic meaning. The practice relies on the expectation on the part of the audience of something humorous, and when this does not happen, the irony itself is of comedic value.