Ok, Christian Bale does a really good job at being Batman. But HOLY MOTHER OF GOD HEATH LEDGER. That man cast Joker in a light I never thought possible. I mean, I always loved the idea of the Joker, because he's not a man out with some plan to dominate the world or become the supreme evil or whatever. Screw all those wussies that ever wanted to become Dark Lord of the Sith or Supreme Ruler of the Galaxy or whatever. Screw Ganondorf, screw Sephiroth, screw Revolver Ocelot, screw Major Zero, screw all those losers with an agenda. The real cool bad guys are the ones who "just want to watch the world burn".
I mean I always loved the Joker's madness because while every other bad guy valued sanity, Joker reveled in madness. But Ledger totally cast madness in a completely new light I thought only belonged to militant anarchists.
I mean, an anarchist still has ideals. Yeah, total freedom, down with corporations, whatever. But the Joker?
"See, I'm an agent of Chaos. I exist to show all the schemers and planners just how pathetic their attempts to control things are."
"I'm like a dog chasing cars, I don't know what I'd do if I caught one, I'd just do...things...."
Seriously, the best villain in history. No better Joker has come before.