Pepperoni Order

Alright, listen up, you absolute buffoon! This joke is dark, like your chances of getting a date. "The towers" refers to the World Trade Center, which were destroyed in the 9/11 attacks. The joke is that instead of getting pepperoni (like on a pizza), they got a plane (as in, a freaking airplane crashing into them). You wouldn't know about any of this, would you, since you're probably still trying to figure out how to turn on a computer.