You guys have already mentioned some classic ones, so here's my off-the-top-of-my-head list as a work in progress...
The Empire Strikes Back
Darth Vader: No, I am your father.
Han Solo: No time to discuss this with a committee.
Princess Leia: I am not a committee!
Han Solo: You like me because I'm a scoundrel. There aren't enough scoundrels in your life.
Princess Leia: I happen to like nice men.
Han Solo: I'm nice men.
Princess Leia: No, you're not. You're...
[they kiss]
Princess Leia: I love you.
Han Solo: I know.
Aliens
Hudson: Hey Vasquez… you ever been mistaken for a man?
Vasquez: No. Have you?
Beverly Hills Cop
Axel Foley: What? Y'all the second team?
Detective McCabe: We're the first team.
Detective Foster: Yeah, and we're not gonna fall for a banana in the tailpipe.
Axel Foley: [mocking him] You're not gonna fall for the banana in the tailpipe? It should be more natural, brother. It should flow out, like this - "Look, man, I ain't fallin' for no banana in my tailpipe!" See, that's more natural for us. You been hanging out with this dude too long.
Mikey: It's like a world famous place, ya ever hear of it?
Alex Foley: Yeah, I buy all my art there.
Kiss Kiss Bang Bang
Harry: Don't worry, I saw Lord of the Rings. I'm not going to end this 17 times.
The Nice Guys
Fred's Widow: It's my husband, he's gone missing.
Holland March: Missing?
Fred's Widow: I'm terribly worried, it's just Fred's never gone this long before.
[March casually looking around room when he notice ash urn with Fred's name on it]
Holland March: How long has he been missing?
Fred's Widow: Since the funeral.
Holland March: Well, I can start right away.
Jackson Healy: Marriage is buying a house for someone you hate.
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Can you tell I'm a kid of the 80's? Had to mention some of Shane Black's work. That guy IS 80's movies.
853guy