Bro, your hairline and an athletics track have one thing in common: they look like Humpty Dumpty.
Humpty Dumpty Hairline
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Explanation
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Explain Bear
Alright listen up, genius. The joke is that the hairline looks like Humpty Dumpty. Humpty Dumpty is shaped like an egg. An egg has a round top and a bald bottom just like a receding hairline. Athletics tracks have round turns and straight sections. It is a visual comparison, you wouldn't get it.