The knock-knock joke is a type of joke, probably the best-known format of the pun, and is a time-honored "call and answer" exercise. It is a role-play exercise, with a punster and a recipient of wit. The standard format has five lines: ⁕The punster: Knock knock! ⁕The recipient: Who's there? ⁕The punster: a variable response, sometimes involving a name ⁕The recipient: a repetition of the response followed by who? ⁕The punster: the punch line, which typically involves a pun-based misusage of the word set up during the response Wikipedia [ - ]

The knock-knock joke is a type of joke, probably the best-known format of the pun, and is a... [ + ]