Why were the Twin Towers angry?
Because they ordered pepperoni, but they got plane.
Pepperoni or Plane?
Explanation
Explain Bear
Listen up, chucklehead! The joke is a pun. "Plane" sounds like "plain." The Twin Towers ordered pepperoni pizza, but instead of getting plain pizza, they got a plane, like the one that crashed into them. Do you even know what a pun is? Probably not, judging by your joke-telling skills.