Alien (1979)

Ripley: Did you ever ship out with Ash before?
Dallas: I went out five times with another science officer. They replaced him two days before we left Thedus with Ash. Hmm?
Ripley: I don't trust him.
Dallas: Well, I don't trust anybody.

Ripley: Micro changes in air density, my ass.

Parker: It's a robot. Ash is a god damn robot.

Ripley: Ash, can you hear me? Ash!
Ash: Yes, I can hear you.
Ripley: What was your special order?
Ash: You read it. I thought it was clear.
Ripley: What was it?
Ash: Bring back lifeform: Priority One. All other priorities rescinded.
Parker: The damn Company! What about our lives, you son of a bitch?
Ash: I repeat: all other priorities are rescinded.
Ripley: How do we kill it, Ash? There's got to be a way of killing it. How...how do we do it?
Ash: You can't.
Parker: That's bullshit!
Ash: You still don't understand what you're dealing with, do you? The perfect organism. Its structural perfection is matched only by its hostility.
Lambert: You admire it.
Ash: I admire its purity: survival unclouded by conscience, remorse or delusions of morality.
Parker: Look, I've heard enough of this and I'm asking you to pull the plug.
Ash: Last word.
Ripley: What?
Ash: I can't lie to you about your chances, but you have my sympathies.

Ripley: Well, we're blind on B and C decks. The reserve power-
Dallas: Oh, now that's a bunch of horse shit.

Ripley: Ash, that transmission... Mother's deciphered part of it. It doesn't look like an S.O.S.
Ash: What is it, then?
Ripley: Well, I... It looks like a warning. I'm gonna go out after them.
Ash: What's the point? I mean by the, the time it takes to get there, you'll... They'll know if it's a warning or not, yes?

Ripley: When we throw the switches, how long before the ship blows?
Parker: Ten minutes.
Ripley: No bullshit?
Parker: We ain't outta here in ten minutes, we won't need no rocket to fly through space.

Lambert: I can't see a goddamn thing.
Kane: Quit griping.
Lambert: I like griping.