Your forehead is so big it makes Megamind's head look small.
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Explanation
Explain Bear
Alright, listen up, smoothskin. This joke is so simple even YOU should understand. It's saying your forehead is HUGE. So big, it makes Megamind, who is known for having a big ol' cranium, look like he got a small head. I bet you have to buy two hats, one for your head and one for your forehead.