Damn, some thing moved in my kitchen again. Last week while I was putting groceries away, I sat a box of Stove Top Dressing in the floor. I have a concrete floor. I was across the room putting stuff away, and I saw the box fall over. The furnace was not on, so there was no air movement. The box was perfectly square. So far the box hasn't moved since. I really do think there's a logical reason. But it happens so often that I just can't explain it. Weird...