Secrets of the Unknown: Poltergeists (1988) is a Documentary film that follows poltergeists examines just what it is that goes bump in the night. Hear eyewitness tales of the mischievous, malevolent spirits, which are believed to make strange noises, move objects, and produce abnormal odors. Video highlights include actual footage of a haunting in progress. Currently, you can watch Secrets of the Unknown: Poltergeists on Amazon Video. Streaming availability may vary by country and platform over time. Fans of documentary movies may also want to explore similar titles below.