McGee: Rule number 70 - keep digging till you hit bottom.
Abby: McGee! There is no rule 70.
McGee: Well, I--
Abby: You just made up a rule. This McGibbs thing has really gone to your head. I don't even recognize you right now.

[voiceover] Anyone can achieve their fullest potential, who we are might be predetermined, but the path we follow is always of our own choosing. We should never allow our fears or the expectations of others to set the frontiers of our destiny. Your destiny can't be changed but, it can be challenged. Every man is born as many men and dies as a single one.

McGee

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.

Cabot: As you know, the Navy is trying harder than ever to eradicate sexual assault in their ranks.
Gibbs: Was Ensign Tate a rape suspect?
Cabot: Right to the point, as always. No Gibbs, Tate was a second-party complainant. He reported an assault on behalf of a friend.

McGee: I should have been here when you woke up.
Delilah: You're here now.

[after killing Salim] Let's go home.

Gibbs

He ruined my jacket. I'd shoot my own mother

Agent Fornell

You, Gibbs, are an enabler!

Abby

Margaret: Obstetrics? I thought you wanted to specialize in heart surgery?
Young Ducky: It's another four years of university. I've had it up to here with cadavers. To be honest, if I never see another dead body again it'll be too soon.

Margaret: Why didn't you ever marry? You had so much love to give.
Ducky: A colleague and a very good friend of mine lost his soul mate. And then he nearly wrecked his life marrying the wrong woman over and over, trying to find her again. I chose to skip that part.

I'm not alone.

Gibbs

Never assume. (Season 9, Episode 21)

Rule #8
NCIS quotes are not to be missed. The crime solving is great and all, but the one-liners from the characters - and Tony's movie quotes, and Gibbs' one-word zingers - are often some of the most memorable parts of a given episode. Be it simple or profound, the show has a way of amping up the drama when it matters most and using levity to keep things grounded. NCIS quotes cover the full spectrum and then some.

NCIS Quotes

McGee: Rule number 70 - keep digging till you hit bottom.
Abby: McGee! There is no rule 70.
McGee: Well, I--
Abby: You just made up a rule. This McGibbs thing has really gone to your head. I don't even recognize you right now.

[voiceover] Anyone can achieve their fullest potential, who we are might be predetermined, but the path we follow is always of our own choosing. We should never allow our fears or the expectations of others to set the frontiers of our destiny. Your destiny can't be changed but, it can be challenged. Every man is born as many men and dies as a single one.

McGee