A supernatural phenomenon which manifests itself as a force that moves objects around, sometimes in a destructive manner. While some theories identify the poltergeist as a ghost, others say that it is the unconscious use of psychokinetic powers by a resident of the afflicted house, often an adolescent. (Poltergeists do seem to frequently pop up in houses where a teenager or a child nearing puberty lives.)

Also a 1982 film directed by Tobe Hooper and written by Steven Spielberg in which a suburban family is terrorized by angry ghosts. The lines "Go into the light" and "They're heeere..." are from Poltergeist.

The word comes from the German, roughly translating as "knocking spirit".