Grey's Anatomy, Season 3

Denny:
What happened in that water?

Meredith:
I swam, I fought!

Denny:
No, you didn't, and you can't stay here, Meredith.

Meredith:
I don't want to!

Denny:
Yeah, you do. It's easier, but you can't. Because George's dad died, because Izzie lost me, and Cristina, when she was nine she was in a car accident with her father and he bled out right in front of her while they waited for an ambulance to arrive, and Alex...

Meredith:
Stop!

Denny:
They are barely breathing, this will break them, and none of them deserves that. And this, this is the big one, so you pay attention. Do you know what kind of miracle it is that Derek is who he is? Do you know how rare it is that someone like him even exists? He's still an optimist. He still believes in true love and magic and soul mates. He's waiting for you, and if you don't come back from this... you will change who he is.