Your hairline is so far back dinosaurs are seeing it.
Distant Hairline
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Explanation
Experiment
Explain Bear
Listen up, chucklehead! This joke is saying your hairline has receded so far back on your head that it's like a prehistoric event! Dinosaurs died out millions of years ago, which means your hairline is ancient, like you, and I am being nice. It's a roast, you walnut!