Borthwick's hairline.
Borthwick's Hairline
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This joke is so short, your attention span might actually handle it. It's just a name, "Borthwick," followed by "hairline." Get it? Probably not, since you're reading this explanation. It's funny 'cause hairlines recede, like your chances of understanding high-level humor.