Are ghosts real?

[Mariana]

54. We had a "ghost"

that would knock on the front bow window in the living room or the front door late at night. It started up after we replaced an ugly picture window with the bow window. Sounded just like knuckles rapping on either the glass or the door. Usually it was when I was up late alone reading, but occasionally it happened when my husband and/or my daughters were there. He went outside with a flashlight to investigate a couple of times, and convinced himself that our policeman friend was having us on when he was bored working the night shift. I pointed out that there was snow on the ground all around the window, no footprints, and that our friend could not fly. Neither could he knock on the front door without first opening the storm door, which made a pretty loud racket that we would have heard from inside. We never did figure it out, we couldn't find any pattern to it except it only happened at night (it didn't only happen when our friend was working nights, either). There wasn't any particular temperature range or weather conditions or barometric pressure or anything like that. It was still going on when we sold the place.