Yes the house I grew up in had a ghost, or whatever you want to call it.
I have experienced it, and I know it is real. What was it exactly? I don't know. I suspect he was the original owner of the house which was over a hundred years old. All I really know is that it wasn't of this world, as we know it.
I understand those who don't want to believe, however, I think it is very narrow minded of those who choose to blast someone who has experienced this type of thing, just because they never experienced it.