Sorry, haven't read all the posts to see if these have already been mentioned, but here are mine (all from one of my favourite movies, "One Flew Over The Cuckoo's Nest") .....
McMurphy: Which one of you nuts has got any guts?
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Chief Bromden: My pop was real big. He did like he pleased. That's why everybody worked on him. The last time I seen my father, he was blind and diseased from drinking. And every time he put the bottle to his mouth, he don't suck out of it, it sucks out of him until he shrunk so wrinkled and yellow even the dogs didn't know him.
McMurphy: Killed him, huh?
Chief Bromden: I'm not saying they killed him. They just worked on him. The way they're working on you.
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McMurphy: I must be crazy to be in a loony bin like this.
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McMurphy: I'm a goddamn marvel of modern science.
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Nurse Ratched: Aren't you ashamed?
Billy: No, I'm not.
Nurse Ratched: You know Billy, what worries me is how your mother is going to take this.
Billy: Um, um, well, y-y-y-you d-d-d-don't have to t-t-t-tell her, Miss Ratched.
Nurse Ratched: I don't have to tell her? Your mother and I are old friends. You know that.
Billy: P-p-p-please d-d-don't tell my m-m-m-mother.
(I so wanted to jump into the movie and kick that bitch in the head at that point!)
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McMurphy: What are you doin' here? You oughta be out in a convertible bird-doggin' chicks and bangin' beaver.
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McMurphy: They was giving me ten thousand watts a day, you know, and I'm hot to trot! The next woman takes me on's gonna light up like a pinball machine and pay off in silver dollars!
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McMurphy: She was fifteen years old, going on thirty-five, Doc, and she told me she was eighteen, she was very willing, I practically had to take to sewing my pants shut. Between you and me, uh, she might have been fifteen, but when you get that little red beaver right up there in front of you, I don't think it's crazy at all and I don't think you do either. No man alive could resist that, and that's why I got into jail to begin with. And now they're telling me I'm crazy over here because I don't sit there like a goddamn vegetable. Don't make a bit of sense to me. If that's what being crazy is, then I'm senseless, out of it, gone-down-the-road, wacko. But no more, no less, that's it.
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McMurphy: What do you think you are, for Chrissake, crazy or somethin'? Well you're not! You're not! You're no crazier than the average asshole out walkin' around on the streets and that's it.
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Dr. Spivey: Well, the real reason that you've been sent over here is because they wanted you to be evaluated... to determine whether or not you are mentally ill. This is the real reason. Why do you think they might think that?
McMurphy: Well, as near as I can figure out, it's 'cause I, uh, fight and fuck too much.
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McMurphy: Well I don't wanna break up the meeting or nothin', but she's somethin' of a cunt, ain't she Doc?
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Harding: I'm not just talking about my wife, I'm talking about my LIFE, I can't seem to get that through to you. I'm not just talking about one person, I'm talking about everybody. I'm talking about form. I'm talking about content. I'm talking about interrelationships. I'm talking about God, the devil, Hell, Heaven. Do you understand... FINALLY?
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McMurphy: I can't take it no more. I gotta get outta here.
Chief Bromden: I can't. I just can't.
McMurphy: It's easier than you think, Chief.
Chief Bromden: For you, maybe. You're a lot bigger than me.
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And there are many more such memorable moments from this wonderful movie .... Definitely Jack Nicholson's crowning achievement!