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• Knock knock. who's there? honeydew. Honeydew who? Honeydew you love me? now we cantalope.
• Knock, knock. Who's there? Waddle. Waddle who? Waddle I do if you don't open the door?
• Knock, knock." "Who's there?" "Oz." "Oz, who?" "Oz be the new mayor!
• Knock, knock. Who's there? Harry. Harry who? Harry up, I'm hungry!
• Knock, Knock S. Hussein: "Who's there?" KA S.
  H. "Ka who? " KA_BOOM!!!!!...
• Knock knock Who's there? Little old lady Little old lady who?
  Gee, I didn't know you knew how to yodel....