Never assume. (Season 9, Episode 21)

Rule #8

Never take anything for granted. (Season 3, Episode 10)

Rule #8

Always be specific when you lie. (Season 1, Episode 23)

Rule #7

Never apologize. (Season 7, Episode 12, but referenced previous times without a number attached)

Rule #6

You don't waste good. (Season 8, Episode 22)

Rule #5

The best way to keep a secret? Keep it to yourself. Second best? Tell one other person, if you must. There is no third best. (Season 4, Episode 11)

Rule #4

Never be unreachable. (Season 3, Episode 13, Gibbs)

Rule #3

Don't believe what you're told. Double check. (Season 1, Episode 1, Mike Franks)

Rule #3

Always wear gloves at a crime scene. (Season 1, Episode 1, Mike Franks)

Rule #2

Never screw over your partner. (Season 4, Episode 14, Gibbs)

Rule #1

Never let suspects stay together. (Season 1 Episode 1, Mike Franks)

Rule #1

Bishop: Seriously? How'd you get that?
Tony: Well, it's like Gorillas in the Midst. You'll get to understand his grunts.

NCIS Quotes

‘You think you’re alone in the dark. Close your eyes. Remember everything good.’ My mom said that to me just before she died. Smart lady.

Gibbs

I'm more of a Super-Mario guy, myself.

Captain Wescott