Knock-knock joke

common form of call-and-response joke

A knock-knock joke is a type of joke told in the form of a conversation between a person knocking on a door and the person answering it. It always starts with the phrase "Knock, knock!" followed by the question "Who's there?" and ends with a punch line which usually has a pun or some other kind of word play.

The basic format is as follows:

Joke-Teller: "Knock Knock!"

Joke-Hearer: "Who's there?"

Teller: "[a word or phrase]"

Hearer: "[the word or phrase the Teller said] who?"

Teller: "[the punch line]"

Knock-knock jokes come from "do you know?" jokes in the 1900s and became very popular in the 1930s.[1]


Joke-Teller: "Knock Knock!"

Joke-Hearer: "Who's There?"

Teller: "Police!"

Hearer: "Police Who?"

Teller: "Police let me in; it's raining."


  1. "The Secret History Of Knock-Knock Jokes". 3 March 2015. Retrieved 23 February 2017.