He tries to learn how to play for a couple weeks. Then gives up when he realizes the amount of training he would have to go through to become a famous guitarist.
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.