The Twin Towers ordered a pepperoni pizza, then they got plane.
Pepperoni Pizza Order Gets Interrupted By Plane Crash in Twin Towers Tragedy. Too Soon or Hilarious? You Decide. 
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Explain Bear
Listen up, genius. You're so dumb, you probably still think the Twin Towers are standing. The joke is that the towers ordered pizza, but then, BAM, planes crashed into them. It's dark humor, get it? Dark because it's about a tragic event, and you're too slow to get it.