Bishop: All we know for sure is that he went to college with Amanda Kendall. His murder could be a coincidence.
Gibbs: McGee.
McGee: Rule 39, Bishop.
Bishop: Right. No such thing as a coincidence. I knew that one.

I'm not alone.

Tony: You know, I've been thinking about getting a dog.
Gibbs: He's not a dog. He's a Marine.

McGee: Boss do you think I made the right decision with my father?
Gibbs: To be the bigger man? Maybe it's time he learned from you, McGee.

Sometimes you're wrong. (Season 7, Episode 24, titled "Rule Fifty-One")

Rule #51

Admiral Chase: Does Agent David carry a weapon?
Gibbs: She is a weapon.

Butt out McGee. Butt off my desk, Borin.

Ky Van Tu: This man - he help me bury my mother, my father. I want to thank him but I do not know how. So I follow. I follow far, behind. Soon I hear gun and I hide. After, I see my friend dead.
Gibbs: You saw his body?
Ky Van Tu: Yes. I run home for my cart, and I bring my friend here.
Gibbs: Why?
Ky Van Tu: I bury him next to my parent. I do not know that his family look for him. This is how I honor him. This is how I thank him.

Gibbs: What are you doing here?
Diane: I brought her. You two need to talk. And we all know that's not something you're interested in.
Gibbs: Got that right.
Diane: So I suggested that---
Gibbs: Ambush me at a crime scene so I can't get away?

Bishop: Lorin Davis, you are under arrest for the murder of Staff Sergeant Martin Roe.
Gibbs: And when we're through with you the FBI wants to talk about the theft and sale of human organs.

Gibbs: The VA's got a lot of programs for vets, Doc. I wonder why Durbin was living on the streets.
Ducky: I recently read a HUD report. It estimates on any given night, between fifty and sixty thousand men and women who have served, are sleeping on the streets or in shelters.

Gibbs: So do we? Lay off?
Vance: The man killed my wife, Gibbs.

NCIS Quotes

Abby: It's okay. Breena's fine. Breathe. Good. Now hurry up and get to the hospital because Breena is in labor.
McGee: Jimmy? Did you hear what she said? She just said Breena's having a baby. I think you broke him.

Qasim: Who did you lose, exactly?
Bishop: A co-worker, a few years ago.
Qasim: It stays with you doesn't it? It's a heavy burden to bear alone.
Bishop: Look, I focus on the analytic aspects of things. That's where I'm effective. It's how I can best help people.
Qasim: And who is it that helps you? It's what we don't say that weighs the most. I hope you find the answers you're looking for.