Little Johnny has no arms. Knock, knock, who's there?
Not Johnny.
Armless Johnny
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Explanation
Explain Bear
Alright, listen up, buttercup. This joke is funny 'cause Little Johnny ain't got no arms, right? So when someone knocks, he can't answer the door. It's a play on words, see? "Not Johnny" sounds like "no Johnny." I bet you're the kinda person who still uses Internet Explorer.