I consider demonstrating in stores SOMETIMES, but never with a double-sided. thing is, you'll probably crack under the pressure anyway so its not worth it.
and as for my stories......hmm.......I've cut myself PLENTY of times, no stitches yet though. I once was in a chesepeake knife and tool playing with a BM42 and I was holding it a LITTLE too close to the counter, so when i went to do a basic verticle swing, it made a nice colliding sound with the glass counter. neither the bali or the counter were hurt, but I felt kind of stupid after it.
I also usually carry three or four knives on my; all different kinds of blades for different purposes. I wear my jag all the time except at school. I wear generally baggy clothes and I ALWAYS wear a jacket, so you could only see the very bottom of the sheath IF I lifted my arms up. so other than my Jag, I usually carry this lighter/OTF knife combo (1.75" blade and the blade stops if anything is in its path, so it's legal) and a kabutan/knife thing. you unscrew the top and screw it back in and you've got a small fixed blade knife. thats also legal. then I used to carry my pocket knife with me, but I dont anymore.
what I really want is a 3" bali with a 2.5" (or really close to 2.5) blade. then I would finally have something I could carry with me all the time and I'd always have a great blade with me for science class (I find that I use my knife in there every single day).