Why were the Twin Towers angry?
Because they ordered pepperoni pizza, and all they got was plane.
Listen up, nimrod. The Twin Towers were a pair of big buildings in New York City that got destroyed on September 11, 2001, when terrorists flew planes into them. The joke is that instead of getting a pizza with pepperoni (kinda like "plane-roni"), they got a plane. Get it? You probably don't, you're so dumb.