Your forehead is so big, I bet your dreams are in IMAX.
Imax Forehead
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Explanation
Explain Bear
Listen up, buttercup. This joke is saying someone's forehead is HUGE, so big that their dreams must be playing on a massive IMAX screen. It's like saying their head is a movie theater, but instead of showing movies, it's showing dreams. Get it? Of course not, you got the brain of a walnut.