" COBB: What do you want from us?
SAITO: Inception.
Arthur raises his eyebrows. Cobb is poker-faced.
SAITO: Is it possible?
ARTHUR: Of course not.
SAITO: If you can steal an idea from someone's mind, why can't you plant one there instead?
ARTHUR: Okay, here's planting an idea: I say to you, "Don't think about elephants."
(Saito nods)
What are you thinking about?
SAITO: Elephants.
ARTHUR: Right. But it's not your idea because you know I gave it to you.
SAITO: You could plant it subconsciously-
ARTHUR: The subject's mind can always trace the genesis of the idea. True inspiration is impossible to fake.
COBB: No, it isn't.
SAITO: Can you do it?
COBB: I won't do it.
SAITO: In exchange, I'll give you the information you were paid to steal.
COBB: Are you giving me a choice? Because I can find my own way to square things with Cobol.
SAITO: Then you do have a choice.
COBB: And I choose to leave. "

― Christopher J. Nolan , Inception: The Shooting Script