Reminds me of my favorite knock knock joke, in a similar vein but not veiled. From the movie Catch Me If You Can: Carl Hanratty: Well, would you like to hear me tell a joke? Earl Amdursky: Yeah. Yeah, we'd love to hear a joke from you. Carl Hanratty: Knock. Knock. Earl Amdursky: Who's there? Carl Hanratty: Go **** yourselves.