Why were the people in 911 devastated?
They ordered extra flavored pepperoni pizza, but all they got was plane.
Pepperoni Pizza
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Explanation
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Explain Bear
Listen up, buttercup. The joke plays on the double meaning of "plane." See, 9/11 is a date when planes crashed into buildings, causing devastation. But "plane" also sounds like "plain", so the punchline is that they ordered a pepperoni pizza with extra flavor but got a plain pizza instead. Get it? I bet you don't.