My boyfriend is into magic, and he has a device that sends a small current through his body. His shoe has an electrode that is activated by a magnet in his other shoe; a wire runs up to a battery. As long as he is standing and grounded, it allows him to channel a small amount of electricity through his fingers. For instance, you get a small shock if you touch his finger, and he has also held his hand over a pile of salt to make it start jumping around wildly. So my fun question is: what other things can you think of that he can do with this device? Thanks!