When I was a paperboy, I delivered to old terraced houses with frosted glass in the front doors, the layout being (as usual) the stairs facing the front door, a passage leading back to a kitchen, then a door to the rear garden. In the summer at this particular house, you could see daylight from the front door through to the back. One morning, as dawn was just breaking, I was putting the paper in the front door, when I saw what I took to be a candle flame coming down the stairs. As I watched, thinking the occupier was coming to the front door, the flame turned at the foot of the stairs and proceeded away from me towards the kitchen. It didn't hit me until I got to the front gate that I shouldn't have been able to see this "flame" if someone had been carrying it, after it turned to go towards the back of the house, and I didn't see against the light coming through from the kitchen any person. Whether that constitutes a ghost, I don't know. I do know they got their papers through the door at breakneck speed from then on!! The hairs on my neck still rise as I'm writing this.