NCIS, Season 7

Fornell:
[he and Gibbs walk into Director Vance's office without knocking and turn on the tv] You have a surveillance camera in the conference room now. Hope you don't have one in the elevator.

Vance:
[is crouching behind desk going through files] We don't, not yet at least, Agent Fornell. [sits up] How can I help you?

Gibbs:
To borrow your tv.

Vance:
And my copy of Emily Post. Door was closed.

Gibbs:
I thought you were in MTAC.

Vance:
Well, we all make mistakes. That's why God invented knocking. McGee's int he conference room interviewing Susan Grady.

Fornell:
You sure you don't have a camera in the elevator?

Vance:
When I do, you'll be the first to know, Agent Fornell.