Stick your actor lit in a very dark room.
Cover a light with foil so that light only shines on the actor.
Set up 1 or more camera flashes or get a strobe light behind your actor so when they go off the bright light makes a sort of bright halo around the guy.
(It would help if you had some smoke or dust in the air.)
Lay in some really good electrical sound fx, such as the hum and zap sounds of high-voltage. Overdub that on your video at just the right time and make lots of VERY quick jump cuts of the actor with the strobes behind him from slighty different angles. When played back, you could get a convincing electric-arc feel.
