Batman- The Killing: Joke

And as the lights of the Gotham Police Department flash over two broken figures—one in purple, one in black—we realize the true horror: The Joker may be insane, but his logic is terrifyingly clear. We all think we’re the first guy, bravely shining the light. But deep down, we all know the terror of being halfway across the beam, waiting for it to be turned off.

The Joker’s goal is not to kill Gordon. It’s to break him. He takes Gordon to the "Joker’s Funhouse"—a nightmarish, grotesque carnival—and subjects him to a relentless parade of psychological torture. He shows Gordon the photographs of Barbara. He forces him to walk a tightrope over a pool of alligators. He straps him to a chair and forces him to look at distorted, funhouse-mirror versions of his own trauma. Batman- The Killing Joke

Moore was approached to write a Joker story. Initially reluctant, he was intrigued by the idea of giving the Joker a definitive origin—something that had only been hinted at in past comics (most notably in 1951’s "The Man Behind the Red Hood!" by Bill Finger and Lew Sayre Schwartz). Moore’s concept was bleakly simple: to explore the thesis that anyone, even the most upright citizen, is just "one bad day" away from complete insanity. And as the lights of the Gotham Police