Professor Hans Holzer, an expert in paranormal activity and parapsychology, explains the distinction between true ghosts and spirit visits, with examples from some of the most famous cases of "ghosts that aren't"

According to Hans Holzer, only perhaps ten percent of all ghostly manifestations are true ghosts. The rest maybe impressions left behind by an emotional event in the past, which can be felt or seen by a sensitive person in the living world. Here Holzer explores several cases of various kinds of "non-ghosts" that are often confused with real ghosts, but are nevertheless remarkable, each in it's own way.