Setting aside Blackboard Jungle images of switchblades leaves us with the question why? I ride and drive horses. The last thing I want on my person is a sheath knife. If I get in a wreck it is most likely to hammer me in the kidney. Should I successfully draw it, I have 1200 pounds of frightened animal struggling in tangled harness or barbed wire (btdt.) I DON'T want something that can stab horse or rider. So, I carry a fast opening Spyderco Rescue with sheepsfoot blade. This is one exmple. I am looking at the assisted open knives with great interest.