The Vampire Diaries, Season 2

Stefan:
So you going to tell me why you came back here? Or we're you just playing another game?

Katherine:
Have you not heard a word that I've said? I've answered that question five times over, now.

Stefan:
All right. Good. Make it six.

Katherine:
I want what I want, Stefan. And I don't care what I have to do to get it. My list of victims is a long one, and I have no problem adding one more name to that list.

Stefan:
Come on, Katherine. If you wanted Elena dead, you would have done it by now.

Katherine:
I still can. If I have to, I will snap her neck like a twig. And you know it.

(pause)

I don't want you seeing Elena anymore. If you don't remove her from your life, I will kill everyone that she loves in her life while she watches,and then I will kill her while you watch.

(...)

I've missed you, Stefan. I just wanted to spend some quality time with you.