Three blind mice walk into a bar. They are unaware of their surroundings, so to derive humour from their predicament would be exploitative.
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.