Your forehead is so big, I thought it was a brick wall.
Brick Wall Forehead
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Explanation
Experiment
Explain Bear
Alright listen up, you chucklehead! The joke is that this guy's forehead is so dang big it looks like a brick wall. Get it? A wall is, like, really big and flat, just like the forehead in question. You probably didn't know this, but brick walls are made of individual bricks and are usually used for construction.