The Vampire Diaries, Season 3

Klaus:
Well, look who finally decided to show up to the party.

Damon:
Where is she?

Klaus:
Elena? Ah, she's making a donation to a greater cause. (stops him) I'm afraid I can't let you interfere, mate.

Damon:
You'll have to kill me.

Klaus:
Oh, I would love to kill you. But I made a pledge to your brother and, unlike him, I keep my word. Although, you know what? Thinking about it now, he probably doesn't care that much anymore. (grabs Damon by the throat and pins him against the hood of a car)

Damon:
(talking fast) You don't wanna know about your friend Mikael?

Klaus:
What do you know about Mikael?

Damon:
Just that he knows you're here...

Klaus:
Bluffing.

Damon:
Katherine and I found him. Consider it our leverage.