The Chechen: Joker-man, what you do with all your money?
The Joker: You see, I'm a guy of simple taste. I enjoy dynamite, and gunpowder, and gasoline!
[he pours gasoline on the mountain of cash]
The Chechen: [panicked] What the...?
The Joker: Ah-ta-ta-ta-ta. And you know the thing they have in common? They're cheap.