You're a common man, an ordinary man. You have hopes, dreams, and something that brings you joy. But one day it all goes away. Your hopes. Your dreams. Everything you loved. Even your face. Then you get it. The meaning of life, the reason for being, the purpose of Man. It's all a joke. A terrible, cruel joke. And then you snap. You find a new purpose.
You will be the punchline. You will laugh in the face of death, because you will be staring at the mirror.
I have read the Killing Joke, JLA: The Nail ("John Francis Bacon"). I have watched Batman Beyond: Return of the Joker.
The Joker wins.