Are your forehead and hairline old friends because they go way back?
Old Friends
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Explanation
Explain Bear
Listen here, smartie. The joke is that the person's forehead is so big that it's like it goes "way back," as if it's been around for a long time. Get it? It's a play on words because "way back" can refer to both distance and time. I bet you didn't know that your brain is mostly water and fat. How do you survive?