Poltergeist is a German word meaning noisy spirit. Poltergeists are renowned for physical phenomena such as loud bangs as well as moving objects. They can also physically attack the victim, leaving scratches or other injuries. They are also known to be able to teleport objects.
The shadow people
Shadow people have been reported for as long as humans have been on the planet. In folklore shades are though to be spirits of the dead. More recently videos have appeared purporting to show shadow people or entities.
The Electron incantation website features an exploration of the paranormal as well as ancient mysteries.
The author looks at the evidence with two possibilities in mind,
1/ We are living in base reality.
2/ We are living in a virtual reality simulation