Never get personally involved on a case. (Season 7, Episode 21)

Rule #10

• Permalink: Never get personally involved on a case.
• Rating: Unrated

Never go anywhere without a knife. (Season 1, Episode 13)

Rule #9

• Permalink: Never go anywhere without a knife.
• Rating: Unrated

Never assume. (Season 9, Episode 21)

Rule #8

• Permalink: Never assume.
• Rating: Unrated

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

Rule #8

• Permalink: Never take anything for granted.
• Rating: Unrated

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

Rule #7

• Permalink: Always be specific when you lie.
• Rating: Unrated

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

Rule #6

• Permalink: Never apologize.
• Rating: Unrated

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

Rule #5

• Permalink: You don't waste good.
• Rating: Unrated

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

• Permalink: The best way to keep a secret? Keep it to yourself. Second best? Tell one other person, if...
• Rating: Unrated

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

Rule #3

• Permalink: Never be unreachable.
• Rating: Unrated

Gibbs: Banks? Banks? Talk to me Banks.
Banks: Hannah.
Gibbs: Hannah. Where you from Hannah? What hometown?
Banks: I tried to steer clear, Gibbs. Couldn't shake it.
Gibbs: Hey you are one hell of a pilot.

• Permalink: Hey you are one hell of a pilot.
• Rating: Unrated

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

Rule #1

• Permalink: Never screw over your partner.
• Rating: Unrated

Mann: It's been six years. You must have something to say.
Gibbs: No, no I'm good.
Mann: Hmm.
Gibbs: If you want to talk, you should ride with DiNozzo.

• Permalink: If you want to talk, you should ride with DiNozzo.
• Rating: Unrated