Bill Weinberger at 2010-12-12 14:34:53:
How about Batman vs The Joker in the 1989 Batman:

http://www.youtube.com/watch?v=4vBh2pT9KgQ
Bill Weinberger at 2010-12-12 16:16:06:
Forgot the quote:

Batman: Have you ever danced with the devil in the pale moonlight?
[punches him]
Batman: I'm going to kill you!
The Joker: You IDIOT! You made me. Remember? You dropped me into that vat of chemicals. That wasn't easy to get over, and don't think that I didn't try.
Batman: I know you did.
[punches him again]
Batman: You killed my parents.
The Joker: What? What? What are you talking about?
Batman: I made you, you made me first.
The Joker: Hey, bat-brain, I mean, I was a kid when I killed your parents. I mean, I say "I made you" you gotta say "you made me." I mean, how childish can you get?
Annika W at 2010-12-12 18:18:56:
From Unforgiven -

Little Bill Daggett: I don't deserve this... to die like this. I was building a house.
Will Munny: Deserve's got nothin' to do with it.
Little Bill Daggett: I'll see you in hell, William Munny.
Will Munny: Yeah.
[fires gun]

http://www.youtube.com/watch?v=6Pt2BabW87g
Annika W at 2010-12-12 18:33:03:
When Harry Met Sally

Harry: I've been doing a lot of thinking, and the thing is, I love you.

Sally: What?

Harry: I love you.

Sally: How do expect me to respond to this?

Harry: How about you love me, too?

Sally: How about, I'm leaving.

Harry: Doesn't what I said mean anything to you?

Sally: What is it supposed to mean? I'm sorry, Harry. I know it's New Year's Eve and I know you're feeling lonely, but you can't just show up here and tell me you love me and expect that to make it alright. I mean, what am I supposed to say? Great, Harry, you love me, that settles everything, now we can waltz off into the sunset together? It doesn't work this way.

Harry: Well how does it work?

Sally: I don't know, but not this way.

Harry: I love that you get cold when it's 71 degrees out. I love that it takes you an hour and a half to order a sandwich. I love that you get a little crinkle above your nose when you're looking at me like I'm nuts. I love that after I spend the day with you, I can still smell your perfume on my clothes. And I love that you are the last person I want to talk to before I go to sleep at night. And it's not because I'm lonely, and it's not because it's New Year's Eve. I came here tonight because when you realize you want to spend the rest of your life with somebody, you want the rest of your life to start as soon as possible.

Sally: See, that's just like you, Harry. You say things like that and you make it impossible for me to hate you -- and I hate you. I hate you, Harry. I hate you.

http://www.youtube.com/watch?v=zMo36SfyQhw
Sean Z P Harris at 2010-12-13 00:35:09:
I also suggest:

Jaws:

http://www.youtube.com/watch?v=1gw-qjuR8Kg

Die Hard (couldn't find a better vid):

http://www.youtube.com/watch?v=5kgTRFhdddA

Se7en is also a good shout:

http://www.youtube.com/watch?v=0xG5hSOMGn0
Sean Z P Harris at 2010-12-13 05:48:20:
Also, keeping with the Eastwood theme, how about the end of Dirty Harry?:

http://www.youtube.com/watch?v=daFb3J-cwLg

Harry Callahan: I know what you're thinking, punk. You're thinking "did he fire six shots or only five?" Now to tell you the truth I forgot myself in all this excitement. But being this is a .44 Magnum, the most powerful handgun in the world and will blow you head clean off, you've gotta ask yourself a question: "Do I feel lucky?" Well, do ya, punk?
Steve Axelrod at 2010-12-13 06:07:25:
Ralph Bellamy and Lee Marvin, after Marvin has sent Bellamy's wife back into Mexico with her 'kidnapper'. Turns out, Bellamy was the real kidnapper, the the rescue mission was trick. Bellamy is furious"
"You ... bastard!"
"Yes, sir. In my case, an accident of birth. But you, sir, are a self-made man."
Or this classic from ... well, you know what it's from:

Jake Gittes: How much are you worth?
Noah Cross: I have no idea. How much do you want?
Jake Gittes: I just wanna know what you're worth. More than 10 million?
Noah Cross: Oh my, yes!
Jake Gittes: Why are you doing it? How much better can you eat? What could you buy that you can't already afford?
Noah Cross: The future, Mr. Gittes! The future. Now, where's the girl? I want the only daughter I've got left. As you found out, Evelyn was lost to me a long time ago.
Jake Gittes: Who do you blame for that? Her?
Noah Cross: I don't blame myself. You see, Mr. Gittes, most people never have to face the fact that at the right time and the right place, they're capable of ANYTHING.
CWillGoWrite at 2010-12-13 22:42:40:
THE PRINCESS BRIDE

Prince Humperdinck: First things first, to the death.
Westley: No. To the pain.
Prince Humperdinck: I don't think I'm quite familiar with that phrase.
Westley: I'll explain and I'll use small words so that you'll be sure to understand, you warthog faced buffoon.
Prince Humperdinck: That may be the first time in my life a man has dared insult me.
Westley: It won't be the last. To the pain means the first thing you will lose will be your feet below the ankles. Then your hands at the wrists. Next your nose.
Prince Humperdinck: And then my tongue I suppose, I killed you too quickly the last time. A mistake I don't mean to duplicate tonight.
Westley: I wasn't finished. The next thing you will lose will be your left eye followed by your right.
Prince Humperdinck: And then my ears, I understand let's get on with it.
Westley: WRONG. Your ears you keep and I'll tell you why. So that every shriek of every child at seeing your hideousness will be yours to cherish. Every babe that weeps at your approach, every woman who cries out, "Dear God! What is that thing," will echo in your perfect ears. That is what to the pain means. It means I leave you in anguish, wallowing in freakish misery forever.
Prince Humperdinck: I think you're bluffing.
Westley: It's possible, Pig, I might be bluffing. It's conceivable, you miserable, vomitous mass, that I'm only lying here because I lack the strength to stand. But, then again... perhaps I have the strength after all.
Westley: DROP... YOUR... SWORD!

http://www.youtube.com/watch?v=I_keWS1i3RA