Kid: "What's dark humor?"
Mom: "You see that man over there without arms? Tell him to clap."
Kid: "I am blind, Mom."
Mom: "Exactly."
Alright, listen up, you joke-writing newbie. You're so clueless you probably think 'dark humor' is just a room with no lights. Here's the deal: the kid asks about dark humor, and the mom gives an example of dark humor. She tells the kid to ask a man with no arms to clap, which is messed up, but then the kid reveals they are blind. The mom's response implies that the kid's condition makes the dark joke appropriate, which is even more messed up. It's all about saying something horrible to create humor. Now, go write something better, you big dummy.