Katya: Sometimes, even if you have the keys those doors still can't be opened. Can they?
Jeremy: Even if the door is open, the person you're looking for may not be there, Katya.
Ninotchka: We don't have men like you in my country.
Leon: Thank you.
Ninotchka: That is why I believe in the future of my country.
Ninotchka: The last mass trials were a great success. There are going to be fewer but better Russians.
Ninotchka: What have you done for mankind?
Leon: Not so much for mankind... for womankind, my record isn't quite so bleak.
Leon: Ninotchka, it's midnight. One half of Paris is making love to the other half.
Ninotchka: Let's form our own party.
Leon: Right. Lovers of the world, unite!
Ninotchka: I'm so happy, I'm so happy! Nobody can be so happy without being punished.
Ninotchka: I should hate to see our country endangered by my underwear.
Prologue: This picture takes place in Paris in those wonderful days when a siren was a brunette and not an alarm - and if a Frenchman turned out the light it was not on account of an air raid!
Grand Duchess Swana: The morning after always looks grim if you happen to be wearing last night's dress.
Leon: What kind of a girl are you, anyway?
Ninotchka: Just what you see. A tiny cog in the great wheel of evolution.
Leon: You're the most adorable cog I've ever seen
I want to tell you something Mark, something you do not yet know, but we K-Paxians have been around long enough to have discovered. The universe will expand, and it will collapse back on itself, then will expand again. It will repeat this process forever. What you don't know is that when the universe expands again, everything will be as it is now. Whatever mistakes you make this time around, you will live through on your next pass. Every mistake you make, you will live through again, and again, forever. So my advice to you is to get it right this time around. Because this time is all you have.
K-PAX (2001)
"Every living creature on earth dies alone."
Donnie Darko (2001)