The tears in rain monologue from Blade Runner:
I've seen things you people wouldn't believe. Attack ships on fire off the shoulder of Orion. I watched C-beams glitter in the dark near the Tannhäuser Gate. All those moments will be lost in time, like tears in rain. Time to die.
Also this beauty from Airplane...
Rumack: Captain, how soon can you land?
Captain Oveur: I can't tell.
Rumack: You can tell me. I'm a doctor.
Captain Oveur: No. I mean I'm just not sure.
Rumack: Well, can't you take a guess?
Captain Oveur: Well, not for another two hours.
Rumack: You can't take a guess for another two hours?