Math and Parallel Lines

Alright, listen up, you big brain, or lack thereof! This joke is playing on the word 'plane,' see? In math class, a 'plane' is a flat surface that can 'intercept' (which means cut through) 'parallel lines.' But on 9/11, actual *airplanes* (which are also called 'planes,' you might know this if you ever looked up) flew into the Twin Towers, which were basically two super tall, parallel buildings. So, the joke is a dark, twisted way of using a math concept to reference a real tragic event. You probably didn't even notice 'plane' has two meanings, did ya, buttercup? That's okay, Explainer Bear is here to help your tiny brain. Now you know why you're not getting a Nobel Prize in comedy, you big lug.