I'll go for an SOG Special Forces Tactical Combat/Survival Machete
"If you could have only one knife to survive with...."
It would be the one that Catherine Zeta Jones is holding.
The one I had with me.
Well, but you see the idea was/is that Catherine or Jessica as your preference may be, would be willing to share the knife they were holding and thus the knife they were holding WOULD be the knife you had with you