I have done a little more detective work and I just want to simplify my earlier question this way. When I turn on one specific light switch, what could possibly cause every other plug and switch on that specific circuit to get power? Every light with its switch turned to the on position comes on and every device plugged into a plug on that circuit comes on. When I turn this one light switch off, every other thing on that entire circuit automatically goes off. What could possibly cause this?