Knock, knock.
"Who's there?"
Not your dad.
Not Your Dad
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Explanation
Explain Bear
Listen up, dummy! The joke is funny 'cause the dude says "Not your dad" instead of a name. It's like, surprise! Your dad ain't around, which is real sad, but also kinda funny 'cause it's so unexpected. You probably don't even know who your dad is, so I don't expect you to understand.