Clean up your own mess. (Season 7, Episode 24)

Rule #45

First things first. Hide the women and children. (Season 7, Episode 23)

Rule #44

Never accept an apology from someone who just sucker punched you. (Season 9, Episode 16)

Rule #42

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

Rule #40

There is no such thing as a small world. (Season 10, Episode 14)

Rule #39A

There is no such thing as coincidence. (Season 7, Episode 21)

Rule #39

Your case, your lead. (Season 6, Episode 16; Season 10, Episode 3)

Rule #38

If feels like you're being played, you probably are. (Season 9, Episode 1)

Rule #36

Always watch the watchers. (Season 8, Episode 22)

Rule #35

Rule #27: Two ways to follow: First way, they never notice you, Second way, they only notice you. (Season 7, Episode 15)

Never mess with a Marine's coffee if you want to live. (Season 2, Episode 9)

Rule #23

Never, ever bother Gibbs in interrogation. (Season 4, Episode 10)

Rule #22

NCIS Quotes

Abby: Have the bad things been outweighing the good things all these years and I just ever noticed?
McGee: What do you mean?
Abby: All I ever wanted was to help people with the truth. And I've done that, but then bad still won sometimes. And I just want to file it away, like it never happened so I can go back to being happy.
McGee: There's nothing wrong with that.
Abby: Yes there is McGee because sometimes the Cutwrights and the Dunns, they just keep fighting no matter what the truth is. And sometimes Ricki never gets to see her grandpa again. If the bad outweighs the good then that means that I'm not enough.
McGee: Abby listen to me...
Abby: And if I'm not enough, McGee, then why even try?

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.