Grey's Anatomy, Season 4

Mark:
Dr. Hahn, I heard a crazy rumor about you.

Erica:
That I'm performing open-heart surgery on a man who's wide awake?

Mark:
That's the rumor.

Erica:
That's the truth.

Derek:
Well, I perform awake brain surgery all the time.

Mark and Erica:
Not the same thing.

Mark:
You ever heard of a gentlemen's evening?

Erica:
I'm sorry?

Derek:
The chief is hosting a gentlemen's evening.

Mark:
We're pretty sure it doesn't involve porn, but, you know, we want to be sure.

Derek:
Right.

Erica:
Are you two a couple?

[Derek and Mark burst out laughing]

Derek and Mark:
No.

Erica:
Just checking. [walks away]

Derek:
Why would she ask that?

Mark:
I don't know.