Some tools have obvious uses, yet screwdrivers get used as chisels, prybars, hammers, etc.
Knives are so handy that sometimes they just get used beyond their design. Some of us need a learning curve I suppose. I have broke knife tips before, thinner kitchen knives. I was suprised when it happened, and have not tried to pry with the tip of a knife since.
A guy broke his expandable baton by hitting a tree trunk. He was suprised by this, thinking that the baton is designed for "battle" I guess. Being light and hollow ,they are made to hit people, not large solid objects. Look what happens to a car that hits a tree!