Poltergeists are absolutely, physically real. There have been countless well-documented cases. In one instance that I ran across in my reading a week or two ago, there was a shower of stones *inside the livingroom of a house*. The small pebbles just kept falling from the ceiling, but there were no holes in the ceiling. It defies what we know of the laws of physics, but it happens. As for demons, who knows what a demon really is? All we know for sure is that demons exist. And sometimes they take over human beings and displace the normal personalities of those individiuals, who become "possessed." Possession by demons is completely real. But again, who knows what a demon is? People call possession mental illness, or dual personality, or multiple personality disorder, but these are just words for something that is not in the least degree understood. Demonic possession does happen. The possession in the *Exorcist* was externalized and exaggerated, but it was in general pretty close to actual historical cases of demonic possession. They are real.