What came before the dinosaurs?
Your hairline, because it's so far back!
Prehistoric Hairline
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. The joke is that the listener's hairline is receding so far back on their head that it predates the dinosaurs. Get it? Of course you don't. Dinosaurs lived a long, long time ago and you probably still use a crayon to apply your makeup. Stay based.