Grey's Anatomy Season 8 Episode 16

Cristina (as Mer is dragging her into a closet): What are you doing? Stop it. Ow!
Meredith: What's the plan?
Cristina: You have bony, sharp fingers. What plan? There's no plan.
Meredith: Your plan, which makes it our plan. Whatever it is, I need to know. Are you plotting a murder, a nuclear attack? It's fine. I'll get on board. I'm sure you have a good reason. But just let me know. You're starting to freak me out.
Cristina (pauses, and sighs): I think Owen is cheating on me.
Meredith: Did you see something?
Cristina: No.
Meredith: Did someone else see something?
Cristina: No.
Meredith: Did he do something?
Cristina: No.
Meredith: Well, then how do you know--
Cristina: I don't know. I don't know! I just... know.
Meredith: Cristina--
Cristina: You know what? I am-- I'm being-- I'm being crazy. I'm crazy, right? This is totally... (sighs) I'm crazy. I'm just... We're having a hard time and I'm-- I'm making it into... I'm crazy. I'm-- I'm-- I'm crazy.
Meredith: Okay. ... I really think he's not cheating.
Cristina: I know that.