The Joker is one of the most widely loved villains of all time. I've compiled a list of ten Joker quotes that I find to be some of the most revealing regarding the nature of his madness and/or the depth of his evil. For all of the quotes that I know the source of, I have included it. If you know the source of any quotes that I have not credited please let me know so I may include them.
10 - "I've demonstrated there's no difference between me and everyone else! All it takes is one bad day to reduce the sanest man alive to lunacy. That's how far the world is from where I am. Just one bad day." - The Killing Joke
9 - "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!" - Arkham Asylum: A Serious House on Serious Earth
8 - "This is going to hurt you a lot more than it does me." Batman: A Death In The Family (while beating Jason Todd/Robin)
7 - "Then you're sure, my chilly rodent? You won't rid the world of the pustulant pestilence that is me? It would be so eee-asy and if you did it, you wouldn't have to worry that I'll escape and slaughter some innocent for a grin. Which I will certainly do."
6 - "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 you if I caught it! You know, I just, do things. - The Dark Knight (Movie)
5 - "Well, what if I was really sorry? Would that make a difference? Would that satisfy you? If I was really... really... really... really... REALLY... SORRY? Well, I'm not!"- The Joker: Devil's Advocate (When Tommy Mangles is about to murder The Joker, before/during the Joker's attack.)
4 - "Why can't you see the funny side? Why aren't you laughing?" - The Killing Joke
Here, also, is a video of Troy Baker reading the monologue from the end of The Killing Joke:
3 - "Both of us trying to find meaning in a meaningless world! Why be a disfigured outcast when I can be a notorious Crime God? Why be an orphaned boy when you can be a superhero?" - Batman #663
2 - "I know that if the Universe is meaningless... That's a joke at our expense. If it's meaningful... A different joke. Any meaning we make ourselves- That's us pretending we're in on it."
1 - "In my dream the world had suffered a terrible disaster. A black haze shut out the sun and the darkness was alive with the moans and screams of wounded people. Suddenly, a small light glowed. A candle flickered into life, symbol of hope for millions. A single tiny candle, shining in the ugly dark. I laughed and blew it out." - Shadow of the Bat No. 37