Catherine: So what's she like?
Theodore: Well, her name's Samantha and she's an Operating System. She's really complex and interesting...
Catherine: Wait... I'm sorry. You're dating your computer?
Theodore: She's not just a computer, she's her own person. She doesn't just do whatever I say.
Catherine: I didn't say that. But it does make me very sad that you can't handle real emotions, Theodore.
Theodore: They are real emotions! How would you know...
Catherine: What? Say it. Am I really that scary? Say it. How do I know what?