Your hairline goes so far back that Crown Burger was Crown Sandwiches.
Receding Hairline
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Explanation
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Explain Bear
Listen up, genius! This joke is saying the hairline is receding so far back, it predates the name change of a restaurant. Crown Burger used to be called Crown Sandwiches. It's funny because the joke teller is implying that the butt of the joke is very old.