Just a single switch to the back porch light. I've got the breaker off now and am about to take the plate off and see what's going on. Something fell against the plate cover about a week ago and actually broke the tip of the switch off. It's an old house and an old switch. I wouldn't be surprised if there was some delicate wiring just holding together and the shock from the impact finally convinced it to let go. Thanks for all the suggestions. I think I over reacted a bit when I posted as it doesn't seem like a big deal now.