Grey's Anatomy, Season 3

Burke:
You know, some do come back from this.

Cristina:
You know what? I am not a civilian. I know the science here. It's drinking time.

Burke:
Not yet. You have a responsibility to Meredith.

Cristina:
No. Uh-uh. I don't do this stuff. You should know. I don't go to great lengths.

Burke:
Well, you were there for me.

Cristina:
After. After I knew you were going to make it. Hey, I'm not proud. Okay, I just... I can't. I can't go back there. I can't. I can't go back there and watch her.

Burke:
Listen to me. This is about you and the woman you call your person. And you do know the science here. And if she dies, and you are sitting here when that happens, I can't see you coming back from that. Come and say goodbye to your friend.