Parents are funny. The other night I had a couple on my tour celebrating their kid's graduation from 8th grade without him.
Before kids they had rented a house in Redondo Beach, CA. Every night they would hear furniture being moved around upstairs. They were too chicken to go up and check in the night. But nothing was ever moved when they did go up during the day.
One night when the woman was alone it got so loud, and she was such a nervous wreck, that she screamed, "Stop it. Just stop it up there." Sure enough it did.
The neighboring house could see into their windows, and the neighbors would see an old woman milling around their house. But they never saw her themselves.