Your forehead is so big that I could draw the map of the world on it.
World Map Forehead
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Explanation
Experiment
Explain Bear
Hey, listen up, you dummy! This joke is all about saying someone's forehead is HUGE, like so big you could draw the whole world on it. You know, because maps are big, and foreheads aren't supposed to be... unless you're you, then maybe it checks out.