Guy walks into a bar and asks for 3 shots of vodka and a glass full of ice, the bartender gives him the 3 vodkas, but not the ice, the guy says where's the ice, the bartender says oh, sorry here you go.
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.