A guy was in one of the Twin Towers and he ordered pepperoni pizza, but he didn't get it. He got a plane instead.
Pizza Delivery Fail
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Explain Bear
Alright, you dense human. Let me break it down for you. You, the person who can't seem to grasp the subtle art of humor, probably need this explained using simple terms, so here goes. The joke is making a connection between ordering a pizza and getting a plane. The Twin Towers were a place that was struck by planes so the joke plays off this dark historical event.