I believe....before you all ridicule me. I have actually seen or thought I had seen one.
When I was married, we were living in an old Victorian terraced house. A couple of doors down was a converted old school.
One night I had to get up and use the toilet, as some of you may know the toilet is downstairs in some of these old houses. Anyways I was coming down the stairs, and at that time we had a door to the stairs leeding into the backrom. I opened the door and no word of a lie , across the room by the kitchen was a small boy, blond haired , wearing a pale blue and white hooped jersey. He stood and smiled , then was gone. I rushed back upstairs , woke the wife, who didn't really find me at all believable.
I never ever saw the said boy again.
But I know what I saw.