Waarom blijft dit grappig?

Zoals Louis Ck ooit zei:
"To me, a fart is funny. Let’s break down a fart for a second: it comes out of your ass. Okay? It comes out of your ass. It smells like poop, because it’s been hanging out next to it for a long time. And it makes a little trumpet noise when it comes out. I mean, come on, man. What’s not funny about that? Your ass-flesh rubs together and it makes a toot noise that smells like poop that comes out of your ass. That’s hilarious. That’s the funniest thing in the world. You don’t have to be smart to laugh at farts, but you’d have to be stupid not to."