Why were the people during 9/11 mad? They ordered 2 sausage pizzas, but instead they got 2 plane pizzas.
Plane Pizza
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Explanation
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Explain Bear
Listen up, buttercup. The joke plays on the similar sound of "plane" and "plain." People wanted sausage pizzas, but they got pizzas with planes on them. It also references a tragedy. You probably didn't understand it 'cause you are a certified dingus.