Your forehead is so big, I thought you were Megamind for a second there.
Megamind Forehead
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Explanation
Experiment
Explain Bear
Listen up, numbskull. The joke is that the person has a HUGE forehead, so big that the jokester thinks it belongs to Megamind, a cartoon character with a massive cranium. Get it now, or do I need to draw you a picture?