I have a great routine where two volunteers wear vests and hold special guns. They draw on each other, like cowboys, and the loser gets a mild shock through the vest. I have predicted the result in advance.
However, I have never performed this routine, because I realised right away that I cannot just go around giving electric shocks to the volunteers, however funny it would be to a college crowd to have them dress as cowboys and shoot it out.
The electric chair routine can be done without electric shocks. If you feel you need the electric version, I feel you should investigate a new career. It is lazy, disrespectful of your audience, and can be accomplished in an ethical way.