Knock knock.
Who's there?
Not your dad.
Absent Dad
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This joke is dark. Someone says "Knock knock" and you respond in the usual way. Then comes the punchline: "Not your dad." Get it? Like the dude's dad is GONE. It's funny because it's sad, and you're probably not smart enough to have a dad anyway.