I used to work at radio shack. The rug behind the counter was very efficient at providing static electricity and whenever we touched the barcode scanning wand - zap. So I got a package of 2kv high voltage capacitors and held one lead while touching the other lead to the wand while rubbing my shoes on the carpet, thereby charging the capacitor. I left the charged capacitor on the POS terminal keyboard for the asshole I worked with to discover. Of course he fell right into my trap and picked up the capacitor. It was pretty funny to me, but not to him. This jerk would often steal my sales and talk down to me, he had it coming.