Batman: Vengeance2001

the Batman:
Joker.

the Joker:
Heck of a joke, huh, Bats?

the Batman:
Hilarious. What's the punch-line?

the Joker:
Hmph. Some detective. Here's the joke: I'm not dead, and Gotham is. The punch-line: It's all YOUR fault, Batsy.

the Batman:
The gasworks. The prometheum. It was all you.

the Joker:
That was me, but... Small potatoes. I wanted help, if I wanted to murder a whole city.

the Batman:
Harley.

the Joker:
Sure. Harley had you wrapped around her little... whatever... But I needed more! But I needed more! That's where you came in.

the Batman:
The gasworks.

the Joker:
Ooh. Nice work with that one, Bats. Opening up those valves did wonders for this little "Burning Down Gotham" idea I've been kicking around.

the Batman:
But what about Ivy?

the Joker:
Hah! I've met yams with a higher IQ than that wenchtable! But it was the quietest way to make as much Joker Toxin as I needed...

the Batman:
And the Prometheum?

the Joker:
Well that's the burning question, isn't it?