for those of you who didn't know about this. Years ago when I was taking auto shop we used to take an ignition condenser and charge it on a spark plug wire of a running engine. The condenser would absorb and hold the charge from the plug wire and then when someone touched the condenser they would get zapped. We used to drop them into the shop teachers pocket. I don't know if it's against the forum rules to tell you how to do it but it's not really that dangerous. Anyway, hold the condenser just by the wire,hold the body of it to ground and touch a live spark plug wire to the end of the wire coming from the condenser. Be careful not to touch either the metal condenser or the end of the wire coming from it. Just walk up behind some one and touch them with it and see how high they can jump. Just be sure that they don't have a pacemaker because then it won't be funny.