Bro, is your hairline and your forehead good friends because they go way back?
Hairline and Forehead Friendship
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Explanation
Experiment
Explain Bear
Listen up, buttercup. The joke is about how the person's hairline is so far back on their head that it looks like their hairline and forehead have been friends for a long time because they're so close together. Basically, the joke is saying that the person is balding, which you probably are too, judging by your intellectual capacity.