Grey's Anatomy, Season 3

Meredith:
I'm not sure refusing treatment is what you wanna do-

Ellis:
Apparently, what I want doesn't matter. It isn't even legally binding. So it's really about what you want, Meredith. You're in charge.

Meredith:
You think I like making these decisions for you? You think it's fun to get calls from the nursing home asking if it's okay to change your medication, asking whether I was planning on giving the nurse, who changes you every morning a Christmas tip? But I do it. I do it because there is nobody else. Because you have managed to alienate everybody else in your life and I am the only one, so I have to step up and do it. [voice wavering] You wanna know why I'm so unfocused? So ordinary? You wanna know what happened to me? You. You happened to me.

Ellis:
Then let me refuse the heart surgery.

Meredith:
No.

Ellis:
Why not?

Meredith:
Because killing my mother is not gonna be another thing that happens to me.