The Killing Joke

"The Killing Joke" is a graphic novel published by DC Comics in 1988, written by Alan Moore and illustrated by Brian Bolland. The story explores the relationship between Batman and the Joker, delving into the latter's origin and providing a possible explanation for his madness. The Joker attempts to prove that anyone can be driven insane after one bad day, targeting Commissioner Gordon and his daughter Barbara (Batgirl), resulting in tragic consequences that challenge Batman's moral code.