Knock knock. Who's there? Well, I will tell you who's not there: my dad.
Knock Knock, Where's Dad
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is all about a "knock knock" setup, right? But instead of a funny name at the end, it's about the dude's dad being MIA. So it's funny 'cause it's sad, like your hairline.