If I measured your forehead, it would be 100,000,000,000,000,000 miles long.
Extremely large forehead
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Explanation
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Explain Bear
Listen here, buttercup. This joke is all about how big someone's forehead is. Like, really, REALLY big. So big that if you measured it, it would be trillions of miles long! It's funny because it's an over-the-top exaggeration. You have a forhead.