Think you're talking about a TENS unit..

The little doohickey that shoots electric charges in you.. I own one.. I have sooooooo jacked myself up with those things.. I always wanted to really FEEL the current, so I'd turn it up higher and higher.. and then even higher and higher.. until it was maxed out.. which really wasn't bad..

But, then I'd move and the connection pads would make better contact and I immediately got the full jolt of the thing maxed out.. I'd contort like a zombie and immediately yank the pads off me, shocking the sh*t outta my hands.. immediately drop the pads and then shock the sh*t outta my legs or feet, depending upon where they landed.. it was like watching me be all Three Stooges at the same time..

The area of my neck that seized up from the shock would hurt like hell for a month..

..and mind you, this same scenario played out 6 or 7 times before I pulled the batteries and said never again..

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Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..