One of my favorite quicky items is a screw driver with a twist and a closed circle for a handle. They work are great paint can openers also. It gives me a chance to explain how screw drivers evolved a bit since colonial times, how one can fit a screw driver to a screw especially the type used on guns which require fitting to a slot in the screws with straight walls rather than the normal slanted walled screws... that tends to get them to pause a bit and realize that slotted screws usually accept a driver that is tapered on all four surfaces. That can lead into hardening and tempering of tools, as a chisel is not much different from a screw driver.
As far as the question about shoeing horses, I simply explain that my wife never let me try shoeing hers, but I would be happy to give it a try if they would bring their horse around. Of course no one who owns a horse will agree to that! Plus I explain that horses only need shoes if they will be walking across a surface that required their hoofs to be protected. When my wife had horses, they never needed shoes as they never went on rocky surfaces and never walked on hard surfaces such as roads.
As far as not being a real smith, I can only agree since I have only been doing it as a hobby for over 36 years, but I still hope some day to be considered a "real" smith.
I have a handout that attempts to cover as many of the questions that people ask, including information about the equipment used, web addresses to find out information, the basic steps in making a knife, my contact information, and the local guild that offers classes.
As a professional psychotherapist I recommend avoiding traumatizing kids or adults for that matter. Some people are pretty fragile.