Buffy the Vampire Slayer, Season 5

Spike:
The first was all business, but the second -- she had a touch of your style. She was cunning, resourceful... oh, did I mention? Hot. I could have danced all night with that one.

Buffy:
You think we're dancing?

Spike:
That's all we've ever done. And the thing about the dance is, you never get to stop. Every day you wake up, it's the same bloody question that haunts you: "Is today the day I die?" Death is your art. You make it with your hands, day after day. That final gasp. That look of peace. Part of you is desperate to know: "What's it like? Where does it lead you?" And now, you see, that's the secret. Not the punch you didn't throw, or the kicks you didn't land. She merely wanted it. Every Slayer... has a death wish.

[in a flashback, Spike snaps Nikki's neck]

Spike:
Even you. The only reason you've lasted as long as you have is you've got ties to the world...your mum, your brat kid sister, the Scoobies. They all tie you here, but you're just putting off the inevitable. Sooner or later, you're gonna want it. And the second- the second - that happens...You know I'll be there. I'll slip in... have myself a real good day. Here endeth the lesson. I just wonder if you'll like it as much as she did.