When I was 15, my mother and I were standing in the kitchen talking. There was a rack on the wall holding keys about 8 feet away. A key from the rack flew across the room and hit the floor near our feet. This is the only event in my life I for which I have no explanation.
I don't know (what the key went to). It was an old, heavy key. The house was built in the 1880s, so it could have been original to the house.