X-Rays Emitted From Ordinary Scotch Tape
Maximum Prophet writes "When I was in High School, I built an X-Ray machine that (probably) didn't produce any X-Rays. I used an old vacuum tube and high voltage. Little did I know that simple triboluminescence would have enough energy to do useful work." The catch: you'll need to peel your tape in a vacuum, and have the x-ray film at the ready.
Publishing "Peeling transparent tape in a vacuum produces x-rays" is not the same as patenting "A mobile x-ray device with no power requirements, with x-rays being generated by peeling transparent tape"