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knock-knock joke

From Wiktionary

Noun

[change]

Singular
knock-knock joke

Plural
knock-knock jokes

  1. A knock-knock joke is usually a 5-line joke in which some words in English sound like other words.
    "Knock Knock!
    (Who's there?)
    Lettuce!
    (Lettuce who?)
    Lettuce in, we're freezing!"