Why did Sarah fall off the swing? She had no arms.
What did Sarah get for Christmas? I dunno, she hasn't opened it yet.
Knock knock...
Who's there?
Not Sarah.
Armless Sarah
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Explanation
Experiment
Explain Bear
Alright, listen up, you knucklehead. The joke is funny because Sarah doesn't have arms and can't open the gift or hold on to the swing. Get it? You are probably one of those people that trip over air.