I said cutting tool, self defense option, Survival Option, Fidget Toy and Prybar/Screwdriver/Non Knife Stuff.
That being said, I've always been of the camp that a knife carried primarily as a self defense tool is an awful idea. The only times I'd even consider using a knife as a weapon is if I had no way to run away or a good reason not to, if I'm fighting someone who is outright trying to kill me and if I have no better weapon available (ie. a firearm or a long heavy object), in reach and at my disposal. Even as an infantryman, my chances of using a knife defensively are stupidly small to the point that the fixed blade that rides on my belt when I'm wearing my kit is a 4 inch blade utility knife rather those oversized 7+ inch fighting knives that some guys have convinced themselves they totally must have. Even then I can't escape the John Rambo comments from the usual suspects with a broken $15 chinesium folder attached to their plate carrier.
I also dislike the idea of a tool and potential weapon being referred to as a toy but if I'm being honest, I will repeatedly open and close (but not flick) my sebenza for that satisfying action and click sound or idly fondle a fixed blade from time to time out of boredom. And of course depending on the knife and the situation, I will use it as a prybar, screwdriver, carbon scraper or whatever else (depending on the knife ofc) when I don't have the right tool for the job readily available but need to get the job done quick, I've never broken a knife doing this but then again most my knives are on the thicker side so they can definitely handle these tasks if I'm careful, I'd never try to pry open a log or a crate with my UTX-85, Sebenza or Bushcraft Scout for instance but you bet that my Winkler Woodsman and Bravo 1 have chopped, screwed, pried and scraped countless times without damage. And then the cutting tool and survival option should be self explanatory IMO.