Originally Posted by ken cummings
Not much unless you are holding a wire tied to the rock. Now if you hit a brittle ceramic insulator and break that fireworks happen. Just pray those little idjits near Glasgow do not tie a long piece of bare wire to the rock.
I don't know how I missed that the kids were aiming for the insulators. I heard rumors about stuff like that when I was a kid. Oddly enough, that one of the few dumb things that I didn't do as a kid.
I thought that they were hoping to knock bare wires into each other with a rock.