Nancy Drew and the Mystery of the Fallen Bulb

Last Sunday morning when I woke up the light bulb from my patio was lying on the ground.

I can't imagine someone came up there, unscrewed it and set it on the ground. Especially since five dogs sleep on the patio and they go crazy whenever anyone (even me) approaches within 50 feet.

It was a windy night; could the wind unscrew a light bulb? If so, why didn't the bulb break when it fell and hit the concrete? Perhaps it had a soft landing on one of the dogs? But that would have set the dogs off on a tirade of barking. Could I have slept through that? I doubt it.

This mystery will probably never be solved. I picked up the bulb and put it back into the socket and it works fine.