One of my Co-workers is a noted troublemaker. As I am sure you are all aware, we are having a spot of bother over here with criminals misusing knives. She tried to claim that my SAK is an offensive weapon. It isn't. I should be arrested. It should be taken away from me . I might kill someone with it etc, etc, etc. So I pointed out to her, in the nicest fashion possible, that I could see half a dozen items around her desk that would make perfect murder weapons. Starting with that chair she was sat on......
The point is of course that even if your buck naked, you still have all the know how inside your head. Improvise.