“Enough madness? Enough? And how do you measure madness? - The Joker”

“Sometimes it’s only madness that makes us what we are.”

“It's salt. Why don't you sprinkle some on me, honey? Aren't I just good enough to eat?”

“[He]... watches the Joker rising from his wheelchair, the way a rabbit watches car headlights bearing down, unable to move a single, spotlit muscle. The madman's limbs appear to unlatch as though some psychotic god has chosen to give life to a complicated Swiss Army knife. The Joker's head rotates... the green lasers of his eyes target the keys at the big man's belt, and he shakes his head.”

“Your head's like mine, like all our heads; big enough to contain every god and devil there ever was. Big enough to hold the weight of oceans and the turning stars. Whole universes fit in there! But what do we choose to keep in this miraculous cabinet? Little broken things, sad trinkets that we play with over and over. The world turns our key and we play the same little tune again and again and we think that tune's all we are.”

“Oh, yes! Fill the churches with dirty thoughts! Introduce honesty to the White House! Write letters in dead languages to people you've never met! Paint filthy words on the foreheads of children! Burn your credit cards and wear high heels! Asylum doors stand open! Fill the suburbs with murder and rape! Divine madness! Let there be ecstasy, ecstasy in the streets! Laugh and the world laughs with you!”

“Afraid? Batman's not afraid of anything. It's me. I'm afraid. I'm afraid that The Joker may be right about me. Sometimes…I question the rationality of my actions. And I’m afraid that when I walk through those asylum gates... when I walk into Arkham and the doors close behind me... it’ll be just like coming home.”