Why did Sally fall off the swings?
Because she had no arms.
Knock, knock.
Who's there?
Not Sally!
Sally's Lack of Arms
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Explanation
Experiment
Explain Bear
Listen up, nimrod. Sally fell off the swings because she didn't have any arms to hold on with. And then in the knock-knock joke, Sally can't be the one knocking because, well, she still ain't got no arms! I can see why you would not get this, though. You're probably one of those soy-boys with no muscles.