I must let you know of my experience recently !!
I was upstairs in our attic bedroom setting up my eldest sons computer at about 2pm in the afternoon. Whilst I sat waiting for the computer to boot up, I heard a young child (right at the side of me say) 'Daddy'. I said 'what love' thinking it was my youngest son who is 5 years old. No one answered, so I quickly got up and looked around the bedroom, as my youngest son likes to make you jump...there was no one there, so I quickly opened the door to the stairs, no one there. I then quickly ran downstairs. As I got closer to the living room, I could here him talking to his mum. I entered the living room, and asked my wife if Oliver had been upstairs, but he had'nt.... Spooky.
I also often see someone walk past the window between our living room, and the hall. But when I open the door to the hall, there is no-one there. I have had this confirmed by my mother, who when babysitting for us, as also stated the same.....Also a friend of ours has told me (once I told her these stories) that she hates our hall, as when she babysits for us, will not go in the hall as it has always freaked her out...
I could tell you another 5 or 6 experiences of mine, but I will leave that till next time...