"Do I really look like a guy with a plan? You know what I am? I’m a dog chasing cars. I wouldn’t know what to do with one if I caught it. You know, I just do things. The mob has plans, the cops have plans, Gordon’s got plans. You know, they’re schemers. Schemers trying to control their worlds. I’m not a schemer. I try to show the schemers how pathetic their attempts to control things really are. So, when I say that you and your girlfriend was nothing personal, you know that I’m telling the truth. It’s the schemers that put you where you are. You were a schemer, you had plans, and look where that got you. I just did what I do best. I took your little plan and I turned it on itself. Look what I did to this city with a few drums of gas and a couple of bullets. You know what I noticed? Nobody panics when things go according to plan. Even if the plan is horrifying. If tomorrow I tell the press that, like, a gang banger will get shot, or a truckload of soldiers will be blown up, nobody panics, because it’s all part of the plan. But when I say that one little old mayor will die, well then everyone loses their minds!
Introduce a little anarchy. Upset the established order, and everything becomes chaos. I’m an agent of chaos. Oh, and you know the thing about chaos? It’s fair."

The Joker - The Dark Knight