I have yet to see anything like that and so do you, until there's evidence supporting ghosts there's no reason to believe in them.
You might as well be afraid of a little fairy coming through your window and stabbing you in the night.
Just find a way to preoccupy your mind with something else than spooky stuff and you will stop thinking about these things. >>3720701
I guess that's a real situation to be afraid of but he's inside right now so he doesn't need to worry about that.