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

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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.