A joke made about a caller at the door. It usually ends up as a play on words.\r\n\r\nThe structure of a knock-knock joke is as follows:\r\n\r\nPerson 1: Knock-knock.\r\n\r\nPerson 2: Who's there?\r\n\r\nPerson 1: (Phrase A).\r\n\r\nPerson 2: '(Phrase A)' who?\r\n\r\nPerson 1: (Phrase A) (funny punch line).\n> Here is a knock-knock joke:\n> George: Knock-knock.\n> Reginald: Who's there?\n> George: Em.\n> Reginald: 'Em' who?\n> George: Emphysema! So you better quit smoking!\n

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