Quotes I use from Heath's Joker (from memory so might be a little off):
"Why so serious?"
"Want to know how I got these scars?"
"You remind me of my father. I hated my father."
"Let's not blow things out of proportion."
"A little fight in ya, I like that."
"Everything burns."
"We're going to have tryouts."
"You just couldn't let me go."
"How about a magic trick?"
"It's, it's gone."
"The good cop, bad cop routine?"
"You want to know which of them were cowards?"
"I just want my phone call."
"There's a Batman."
"Hit me."
"Excuse me, I want to drive."
"Hi."
"And you are beautiful."
"I'm just ahead of the curve."
"Harvey, Harvey, Harvey Dent."
There are more, but I couldn't do them from pure memory, and usually just say bits of them. Like the joke about hitting victims in the head making them fuzzy and thus unable to feel the next blow. Because of that scene, I say fuzzy in a weird way now.