Many people who have ghostly experiences claim to see something they refer to as "moving shadows". They aren't really shadows but are more or less moving voids, or dark areas. I worked for five years in a haunted restaurant and never got to actually "see" anything, but the owner had seen what I described above on several occasions. Maybe I'm an idiot, but I always wanted to see it, I mean how unique of an experience would that be? Call it a morbid curiousity...