Hummm, I have a switchblade knife. It is about 3" overall when opened. I found it in a desk drawer some years ago while cleaning out an old building.
These days I use it to open Sunday School supply boxes, cut tape ends, and generally hang on a lanyard about my neck along with a mini flashlight and my key to the church we attend.
I've found it very useful when I have to hold something with one hand, tape with the other, and then cut the end of the tape rather than pull-tear the tape off.
I've always wondered why the "switchblade" has such an evil rapport, when they really don't have any real tactical value for hurting someone, in my opinion.
It really is FUN to push the button and have the cute little blade spring out and make that "click" sound - but hey, is it deserving of controlled status?
All serious knives I've ever seen have NOT been switchblades, so why all the fuss?
I'm not being glib, if there's an answer I'd really like to know!
Happy Sunday!!