Marshall: Lily, sometimes I think about other women. Okay, it happens. But even when I do, I feel so guilty that I have to imagine you... passing away first. Because even in a fantasy world, I could never cheat on you. You're... You're just my life, baby. And I love you.
Lily: You kill me off?! I mean, fantasize about other girls all you want, but could you maybe not murder me?
Marshall: Murder? No! Baby, no. You develop a chronic illness. I spare no expense for your care. I even stand up a foundation in your name. We're, like, this close to a cure.