Why did Sarah call off the swing? Because she has no arms.
Knock knock. Who's there? Not Sarah.
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Explanation
Explain Bear
Listen up, buttercup. The joke is funny because it's unexpected. Sarah can't swing because she ain't got no arms! And the knock-knock part? It's Sarah again, but surprise, she can't knock either because...you guessed it, no arms! You probably thought the joke was deep.
Thing? Person? IDEK-
Please stop repeating jokes- they're not funny if you repeat them-