Which Gibbs' Rule from NCIS (2003) do you think is most important?

Specialized Gibbs' Rules poll options

Specialized Gibbs' Rules

NCIS (2003)

NCIS

• Rule 3: Don't believe what you're told. Double check.
• Rule 9: Never go anywhere without a knife.
• Rule 23: Never mess with a Marine's coffee if you want to live.
• Rule 51: Sometimes - You're wrong.