The problem is that the Joker is not a creature of logic.

He scoffs at rationality and laughs at well-laid plans.

In fact, sometimes the Joker works best when we know very little about him at all.

joker

Everett Collection; DC Comics

Part of the Jokers power inThe Dark Knightdraws from his refusal to truthfully explain his own backstory.

Over the course of the film, he offers 2.5 explanations for how I got these scars.

Obviously both of them cant be true, and the strong implication is that neither is.

This is one of the movies essential subtexts: The Joker is pretty much always lying.

At one point, he famously asks Two-Face, Do I look like a man with a plan?

He just pops up immediately in the shows second episode as if he had always been there.

Explaining how he got that way is beside the point.

There, Jack Nicholsons Joker was also the same man who originally killed Bruce Waynes parents.

All it takes is one bad day.

As this Red Hood tells Batman while dangling over the fateful chemical vat: Its only just beginning.