Poltergeist
Poltergeist (German, "noisy spirit") is the alleged paranormal phenomenon characterized by noises, movement of objects, breaks, opening of doors without apparent cause, attributed to discarnate spirit. Cases documented worldwide; many investigated by parapsychologists, debunked as fraud or psychological phenomena (often involving teenagers in crisis).
Famous cases
Enfield poltergeist (England, 1977-79) — investigated by Maurice Grosse and Guy Lyon Playfair; later doubts about authenticity. Rosenheim poltergeist (Germany, 1967) — investigated by Hans Bender.