Knock-knock jokes

Knock-knock jokes are a popular form of joke telling which calls for a second party to respond to the feed lines, simulating a visitor knocking on the door: "Knock knock!" "Who's there?" followed by a name leading into a final pun. The form was already established by the 1930s. 
One of the best known knock-knock jokes involves the teller repeatedly saying "Banana!" ("Banana who?" "Orange!" "Orange who?" "Orange you glad I didn't say bananas!") Knock-knock jokes have a particular appeal for kids, and have often been used in Sesame Street projects and, periodically, by Fozzie Bear.
==References==
* A knock-knock joke is inserted into “The Story of Ira and Inez”.
* The obnoxious octopus comedian in The Ed Sullivan Show version of "Octopus' Garden" tells knock-knock jokes and puns.
* Ladybugs are familiar with knock-knock jokes. When forced to curtail their jump rope activity at the "Ladybugs' Picnic," they tell knock-knock jokes as a substitute.
* The 1981 album Grin & Giggle with Big Bird includes a knock-knock joke, with silent gaps for the listener to audibly fill in the blanks.
* One of the books seen on Fozzie Bear's night stand in the March 18, 1984 edition of The Muppets comic strip is titled "1000 Knock-Knock Jokes."
* The Muppets comic strip for 02/27/1985 has Fozzie proudly showing off his diploma from the School of Hard Knock-Knocks.
* The third season Fraggle Rock episode "Boober and the Glob" heavily involves Joke Day which traditionally includes a knock-knock joke medley.
* The 1994 lift-the-flap book Knock, Knock! Who's There? takes the knocking more literally than most.
* The 1997 video Elmo Says BOO! includes a knock-knock exchange with an actual door knocker.
* The first season of Big Bag included regular knock-knock joke segments between Lyle and Argyle McSock.
* Knock-knock jokes figure in several Muppet tie-in joke or comedy-themed books, including Elmo and Ernie's Joke Book (2012) and in the publisher's text for Fozzie's Funny Business (2013).
* Smartie delivers a non knock-knock variation of "orange you glad" in "Elmo's World: Fruit."
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Category:Joke References