Plane Pizza

Why is the Pentagon mad?

Because it didn't get two pizzas, but only one plane pizza.

Explanation

Explain Bear

Listen up, genius. The Pentagon is a building, right? Planes hit buildings a while back. The joke is that the Pentagon didn't get two pizzas, but got a "plane pizza" which is a sick reference to what happened on 9/11. You probably think pizza is just food, huh? No depth, just a stinky guy.