Comment I remember (Score 5, Interesting) 311
I worked for a company the built medical diagnostic (EEG & ECG) and treatment (TENS) equipment. We had a few prototype stimulation units that one salesman had the bright idea of connecting up to his brain. It's output was really limited (on the order of a few micro amps) using electrodes attached to his ear-lobes. Turn it on with a low frequency sine wave (1 - 2 Hz) and watch the fun. It was interesting to watch his eyes scan back and forth like a Cylon. The sign wave was super-imposed on the normal impulses, so he could still direct his eyes, but really funny if he was trying to keep his eyes focused on one thing.
I have no doubt that he was doing damage along the way (but hell, he was only a salesman). He claimed that it made him feel high. The stupid bastard was even driving his car with the thing hooked up.
However, you can have all manor of fun with a good TENS unit.
Wow.