Your hairline is so far, too far, even dark humored jokes are scared of it.
Distant Hairline
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Explanation
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Explain Bear
Listen here, genius. This joke is saying the person's hairline is receding so far back that even dark jokes, which are known for being edgy and offensive, are too scared to make fun of it. Basically, the hairline is so bad it's beyond the pale, even for humor that has no limits. You probably have a similar hairline.