Cristina: Apparently they went backpacking around Europe together or something. Before med school. You know that woman all but kicked me out of the bed?
Derek: Oh, that's terrible.
Cristina: And death? Meredith's name's not 'death.' It's Mer!
Derek: I really feel for 'ya.
Cristina: I mean, she's never even mentioned this woman. How good a friend could she be?
Derek: Good enough to kick us both out of bed. ... Welcome to my world.