Why were the twin towers mad?
Because they ordered a cheese pizza, but instead they got plane.
Listen up, buttercup. The "twin towers" is a reference to the World Trade Center, which was destroyed in a terrorist attack involving airplanes. The joke is, instead of a pizza, they got a plane—as in, an airplane crashing into them. You probably think 9/11 is just a convenience store, huh?
United kingdom
This joke is getting old as hell.