It would be a miracle if someone figured out the length of your hairline.
Impossible Hairline Measurement
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Explanation
Explain Bear
Alright, listen up, genius. This "joke" is saying the person's hairline is receding so far back that it's practically impossible to measure. Like, it's a friggin' desert up there. You should know about deserts, especially since you're drier than the Sahara, which gets like, 0.1 inches of rain a year, unlike your brain which gets zero facts.