Here’s a funny hack using a cellphone, wires, and a 16pF capacitor.
Take one SonyEricsson K800i, rewire the capacitor (which feeds the camera flash) with a pair of 16uf caps and you have a cell phone capable of dumping those farads into a human body. Just take a photo using the camera’s xenon flash and shoot.
If you can’t read the multimeter in murk of what looks like a typical teenager’s bedroom, it shows 300 volts. Cameron20020, the video’s creator, describes it thus: