NCIS, Season 7

Abby:
You guys are going to Mexico! What's the plan?

Tony:
What do you know, Abs?

Abby:
Gibbs mentioned rule forty.

Tony:
If you think someone's out to get you, they are?

Ziva:
I have never heard of a rule in the forties.

Tony:
They don't come up very often.

Abby:
And that's a good thing.

Ziva:
How many times have I told Gibbs to write these things down?!

Tony:
You don't have to write them down, they're for daily use, most of the rules, but the forties --

Abby:
The forties. The forties are for emergency use only.

Tony:
If the forties are in play something unspeakably bad is going down.

Ziva:
We have to get him back.