Strange occurance

   Though the house has been quieter than normal, we did have a strange experience last night. It was about 9:30pm, My younger dog and I were in the kitchen finishing up some leftovers. My wife with our older dog at her feet, was working on the computer. As the house is rather large, I had left the lights on in the diningroom, I knew I'd be coming back through that way. The kitchen lights were on, a couple of lights burn in the kitchen 24/7. The Library has a small lamp that is also always on. When I had cleared up the mess in the kitchen, my dog and I started back though the doorway to the short hall that leads to the diningroom. Before I reached the diningroom, the lights went off in the diningroom. Thinking my wife had quit on the computer and was coming through to the kitchen, I said something to that effect. My wife answered me from the Library. So what happened to the lights in the diningroom? My first thought was I'd have to trek down into our dungeon of a cellar and see which breaker blew. But turning I saw the lights that I had left on in the kitchen were still on. Part of the kitchens lights are on the same circuit as those in the diningroom. So I figured we must have a malfunctioning lightswitch. Going over to the wall switch I found it in the "OFF" position. Who turned off my lights before I entered the room? My wife was in a different room and my dogs are too short to reach the switch. This is the second such episode this season. A few weeks back the lamp timer was changed, but not by us. We have experienced less of the walking noises this year, but did we trade it for a poltergist? Ideas anyone?