His hairline is so ugly that Martin Luther King had a dream about it.
Martin Luther King's Nightmare
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Explanation
Explain Bear
Alright, listen up, you chucklehead. This "joke" is saying someone's hairline is so bad, even Martin Luther King Jr., a guy known for having big dreams, had a nightmare about it. I know, I know, it's not that funny. You probably think beets are spicy. Wake up!