Health and safety tips: Looking at your hairline is hazardous. For your best interest, please look away.
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Explanation
Explain Bear
Listen up, buttercup. This "joke" is saying looking at your own hairline is bad for you, 'cause it reminds you you're gettin' old and balding, which is depressing. You probably don't even know what 'hairline' means, do you? Bless your heart.