Your forehead is so big we could fit the whole alphabet on there.
Vast Forehead
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Explanation
Explain Bear
Listen up, buttercup. This joke is a roast. It's saying someone's forehead is HUGE. Like, so big, you could write the entire alphabet on it. Get it? You're so dumb you probably tried to write on your own forehead to check. I bet you also think a 'joke' is something you find in an egg carton.