From Batman (1989), way better then TDK
Grissom: That you, sugar bumps?
[turns around to see a man]
Grissom: Who the hell are you?
Joker: It's me, Sugar bumps.
Grissom: Jack? Oh, oh, thank God you're alive! I heard you'd been...
Joker: Fried? Is that what you heard? You set me up over a woman. A *woman*! You must be insane.
[Grissom goes for his gun]
Joker: Don't bother.
Grissom: Your life won't be worth spit!
Joker: I've been dead once already. It's very liberating. You should think of it as, uh... therapy.
Grissom: Jack, listen. Maybe we can cut a deal.
Joker: Jack? Jack is dead, my friend.
[steps into the light]
Joker: You can call me... Joker. And as you can see, I'm a lot happier.
[laughs, and then proceeds to kill Grissom]
The Joker: [reciting his poem to Vicki] I'm only laughing on the outside / My smile is just skin deep / If you could see inside I'm really crying /
You Might join me for a weep.
Joker: I now do what other people only dream. I make art until someone dies. See? I am the world's first fully functioning homicidal artist.
The Joker: Haven't you ever heard of the healing power of laughter?