Why did little Susie fall off the swing?
Because she has no arms or legs.
Knock knock.
"Who's there?"
Not Susie.
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Explanation
The first part of the joke sets up a simple question with a dark and unexpected answer. The follow up is a knock-knock joke that twists expectations, with the punchline "Not Susie" referencing the first part of the joke. The joke plays on the shock of the unexpected answer and the absurdity of Susie's situation.