When the job is done, walk away. (Season 6, Episode 24)

Rule #11

You do what you have to for family.

Unwritten Rule

Gibbs: Felix, did Dan take a bribe and frame Lourda for the murders?
Betts: We did some good, didn't we? We got some sandwiches inside. You guys hungry?
Pride: Sandwiches sound real good, Felix. Real good.

Gibbs: No costume this year?
Abby: After last year's Jonas Brothers debacle, Vance banned costumes. McGee? Skinny jeans? Didn't work.

Gibbs: Okay. [laughs] Who is she? [Shuts down elevator] The phone. The plans. Are you dating again, Tobias?
Fornell: Okay. And if I am?
Gibbs: Just tell me.
Fornell: Okay. My sex life--
Gibbs: Oh God, just -- [turns elevator back on]

I must fire my rifle true.

Gibbs [voiceover]

Gibbs: Book 'em, Dan-ozzo.
Tony: Nice Hawaii Five-O reference, boss.

Pride: Laissez les bon temps rouler.
Gibbs: Let the good times roll.

Gibbs: You're superstitious?
Vance: I'm a little stitious.

[after killing Salim] Let's go home.

If it seems someone is out to get you, they are. (Season 7, Episode 22)

Rule #40

Vance: You mind some company? I have an hour left with the babysitter.
Gibbs: Yeah? Where'd you go?
Vance: Supposedly group bereavement counseling. Couldn't do it. So, I'm consoling myself with some double chocolate brownies. Would you care to join me? I hate to eat alone.

NCIS Quotes

McGee: All right. Well you should probably know that Abby and I used to date?
Bishop: Ew. Like, each other?
McGee: Yeah.
Bishop: Wait - isn't that a violation of rule 12, never date a....
McGee: It was a long time ago. After we'd broken up, one night I went to her lab. Found a scribbled piece paper; a list. Potential boyfriends had to fulfill certain conditions by a pre-arranged date or else, goodbye.
Bishop: Such as.
McGee: Things started off relatively normal: opening the door for her, flowers, putting the seat down. Then around number 8, it gets uh...
Bishop: What?
McGee: Does she know you have these?
Bishop: Does she know you have these?
McGee: Yeah she wasn't happy when she found out.
Bishop: These are all very specific.
McGee: Yeah.
Bishop: These ideas apply to you?
McGee: No those rules weren't in place when we were together. At least I don't think so.
Bishop: What's with the two month cutoff? Abby's sabotaging herself. I've seen stuff like this before. We have to talk to her.

Tony: One other question, I know you're an expert in English history. And I was just wondering, have you ever heard of Archibald Drummond, the 17th Earl of Trent?
Ducky: The Earl of Trent. No, I can't say I have. Why?
Tony: I was just wondering. Thanks.