Steve, sounds like you've seen Full Metal Jacket once or twice!
I'll have to think about this topic because there are so so so so so many good movie lines. Off the top of my head:
The Empire Strikes Back
Princess Lea: I love you
Han Solo: I know
Monty Python - Holy Grail
He must be the king, he hasn't got any shit on him.
The Graduate:
Plastics.
.........more to follow, I'm sure.
edited to add: this is Teri, not Kerri. I'm using her computer and I didn't realize I'm logged in as her. Oooops.
