The knock-knock joke is a structured word play joke that uses call and response. The joke presents a scenario in which the speaker is pretending to knock on the front door of the listener. The speaker initiates the joke by saying "knock-knock", and the listener responds by saying "who's there". The speaker then says a phrase to identify themselves, and the listener repeats the phrase and asks "who?" to request more information. The speaker then delivers a punch line using word play based on the phrase. The first modern knock-knock jokes were told in the United States in the 1930s, and they became a fad in 1936 with widespread use in the United States and the United Kingdom.
A standard knock-knock joke has five lines of dialogue.
In the first line, the speaker plays the role of someone knocking at the listener's front door by saying "knock-knock". The line is an example of onomatopoeia. It is often spoken with a stylized fall, a type of stylized intonation where the second syllable is said in a lower pitch than the first.
In the second line, the listener's response of "who's there" has them play the role of someone inside their own home as the speaker knocks.
The third line is the point that a person at the door would provide their given name or some other identifier. In the joke, the name does not provide enough information to identify a specific speaker. The joke traditionally uses a name for the third line, but any phrase can be used. If an inanimate object is referenced, it is inferred that the person knocking is a human using the object as a name, rather than the physical object they describe.
The fourth line is normally when the person at home would ask for more information to clarify who is at the door, as a given name or title on its own is not always specific enough to discern a person's identity. In the case of a given name, this can be because the person at home does not know anyone by that name or knows multiple people by that name.
The fifth line breaks from the imagined scenario of a person knocking on a door. Some knock-knock jokes end by repeating the third line, using its phonetic structure as a pun to be the start of a new sentence. In this case, the content of the third line is spoken quickly to blend its sound into the rest of the phrase.
Other knock-knock jokes take advantage of the phonetic structure of the fourth line, and the fifth line is a response to the newly created phrase spoken by the listener.
In both cases, the fifth line effectively changes the meaning of the third and fourth lines.
The origin of the knock-knock joke, or the first appearance of the phrase "knock knock, who's there", is sometimes attributed to William Shakespeare for his 1606 play Macbeth. In Act 2, Scene 3, the character of the porter gives a soliloquy about a porter accepting people into hell.
Writing in the Oakland Tribune, Merely McEvoy recalled a style of joke from around 1900 where a person would ask a question such as "Do you know Arthur?", the unsuspecting listener responding with "Arthur who?" and the joke teller answering "!" He compared it to a joke that emerged in the flapper community around 1920 where a woman would ask "Have you ever heard of Hiawatha?", and upon being asked "Hiawatha who?", she would respond with " a good girl ... till I met you."
A variation of the format in the form of a children's game was described in 1929. In the game of Buff, a child with a stick thumps it on the ground, and the dialogue ensues:
In the United Kingdom, music hall performer Wee Georgie Wood adopted the phrase "knock-knock" as a catchphrase and was recorded in 1936 saying it in a radio play. Meanwhile, a popular knock-knock joke was made at the expense of King Edward VIII.
The Edgmont Cash & Carry, a grocery store in Chester, Pennsylvania, used knock-knock jokes in its advertisements and held a contest for the best knock-knock jokes. Another example of a knock-knock joke appeared in The Rolfe Arrow in Rolfe, Iowa.
Fred Allen's 30 December 1936 radio broadcast included a humorous wrap-up of the year's least important events, which included a supposed interview with the man who "invented a negative craze" on 1 April: "Ramrod Dank... the first man to coin a Knock Knock."
After peaking in 1936, knock-knock jokes received greater push-back from critics who saw them as unfunny, pseudo-intellectual, or pathological. Despite this, they remained a popularly known joke format. Knock-knock jokes have since been popularized in other countries, including Australia, Canada, France, Ireland, South Africa, and the United Kingdom. The format was well known in the UK and US in the 1950s and 1960s, and it enjoyed a renaissance after the jokes became a regular part of the badinage on Rowan & Martin's Laugh-In.
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