Knock knock. Who's there? Knock knock. Knock knock who? I'll knock knock you out if you don't stop.
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Explanation
Explain Bear
Okay, listen up, numbskull. The joke is that the person keeps repeating "Knock knock" instead of giving their name. The person is so annoyed that they threaten to punch the other person aka "knock them out". You are probably the person who keeps repeating the same thing.