In folklore and parapsychology, a poltergeist (German for "noisy ghost") is a type of ghost or other supernatural being supposedly responsible for physical disturbances such as loud noises and objects moved around or destroyed. Most accounts of poltergeists describe movement or levitation of objects, such as furniture and cutlery, or noises such as knocking on doors. Poltergeists have also been claimed to be capable of pinching, biting, hitting and tripping people.
Poltergeists occupy numerous niches in cultural folklore, and have traditionally been described as troublesome spirits who haunt a particular person instead of a specific location. Such alleged poltergeist manifestations have been reported in many cultures and countries including the United States, Japan, Brazil, Australia, and most European nations, with early accounts dating back to the 1st century. The first reported poltergeist was in Germany in 856 AD. 
The word poltergeist comes from the German language words poltern ("to make sound" and "to rumble") and Geist ("ghost" and "spirit"), and the term itself roughly translates as "noisy ghost", "rumble-ghost" or a "loud spirit".
Many claimed poltergeist events have proved on investigation to be pranks. Skeptic Joe Nickell says that claimed poltergeist incidents typically originate from "an individual who is motivated to cause mischief". According to Nickell:
"In the typical poltergeist outbreak, small objects are hurled through the air by unseen forces, furniture is overturned, or other disturbances occur -- usually just what could be accomplished by a juvenile trickster determined to plague credulous adults."
Nickell writes that reports are often exaggerated by credulous witnesses.
"Time and again in other “poltergeist” outbreaks, witnesses have reported an object leaping from its resting place supposedly on its own, when it is likely that the perpetrator had secretly obtained the object sometime earlier and waited for an opportunity to fling it, even from outside the room—thus supposedly proving he or she was innocent."
According to research in anomalistic psychology claims of poltergeist activity can be explained by psychological factors such as illusion, memory lapses and wishful thinking. A study (Lange and Houran, 1998) wrote that poltergeist experiences are delusions "resulting from the affective and cognitive dynamics of percipients' interpretation of ambiguous stimuli".
Attempts have also been made to explain scientifically poltergeist disturbances that have not been traced to fraud or psychological factors. Skeptic and magician Milbourne Christopher found that some cases of poltergeist activity can be attributed to unusual air currents, such as a 1957 case on Cape Cod where downdrafts from an uncovered chimney became strong enough to blow a mirror off of a wall, overturn chairs and knock things off shelves.
Unverified natural phenomena
In the 1950s, Guy William Lambert proposed that reported poltergeist phenomena could be explained by the movement of underground water causing stress on houses. He suggested that water turbulence could cause strange sounds or structural movement of the property, possibly causing the house to vibrate and move objects. Later researchers such as Alan Gauld and Tony Cornell tested Lambert's hypothesis by placing specific objects in different rooms and subjecting the house to strong mechanical vibrations. They discovered that although the structure of the building had been damaged, only a few of the objects moved a very short distance. The skeptic Trevor H. Hall criticized the hypothesis claiming if it was true "the building would almost certainly fall into ruins." According to Richard Wiseman the hypothesis has not held up to scrutiny.
Michael Persinger has theorized that seismic activity could cause poltergeist phenomena. However, Persinger's claims regarding the effects of environmental geomagnetic activity on paranormal experiences have not been independently replicated and, like his findings regarding the God helmet, may simply be explained by the suggestibility of participants.
Poltergeist activity has often been believed to be the work of malicious spirits. According to Allan Kardec, the founder of Spiritism, poltergeists are manifestations of disembodied spirits of low level, belonging to the sixth class of the third order. They are believed to be closely associated with the elements (fire, air, water, earth).
- Drummer of Tedworth (1662)
- Epworth Rectory (1716-1717)
- The Bell Witch of Tennessee (1817–1872)
- Great Amherst Mystery (1878–1879)
- Gef the Talking Mongoose (1931)
- Borley Rectory (1937) investigated by Harry Price who called it "the most haunted house in England".
- Robbie Mannheim (1949), claimed to be demonically possessed after using a Ouija board.
- Rosenheim Poltergeist (1967) investigated by Hans Bender who claimed that a law firm located in Rosenheim in southern Germany experienced disruption of electricity and telephone lines, swinging lamps, and the rotation of a framed picture caused by a 19-year-old secretary who he alleged was "a typical poltergeist."
- The Black Monk of Pontefract (1960s-1970s)
- The Enfield Poltergeist (1977)
- The Thornton Road poltergeist of Birmingham (1981)
- Angelique Cottin (ca. 1846)
- Tina Resch (1984)
- "The Stone-Throwing Spook of Little Dixie" (1995)
- The Canneto di Caronia fires poltergeist (2004–5)
- Barnsley near Sheffield in England (2009)
- "Jim", the Coventry poltergeist (2011). In a series of articles in March 2011, The Sun reported that Lisa Manning and her children believed they were being disturbed by a poltergeist. Derek Acorah visited Manning's home and claimed that he was able to "communicate with the spirit."
- Lithobolia, a narrative folk tale by "Richard Chamberlayne" first printed in London 1698 has been compared to modern poltergeist stories and considered an early example of esoteric literature and supernatural horror writing.
- In the 1941 Noël Coward play Blithe Spirit poltergeist activity is due to the ghost of the central character's first wife—and later to the ghosts of both wives. The play was adapted into a successful movie in 1945, and a musical (High Spirits) in 1963, besides enjoying multiple adaptations to radio.
- William Peter Blatty's 1971 novel The Exorcist and its 1973 film adaptation depicts demonic possession.
- In the Poltergeist movies (1982, 1986, 1988) poltergeist activity in a family home was caused by ghosts attracted to the youngest daughter.
- A poltergeist named Peeves appears in the Harry Potter series, who is described by the series author J.K. Rowling as not a ghost but an "indestructible spirit of chaos."
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- Terence Hines. (2003). Pseudoscience and the Paranormal. Prometheus Books. p. 98. ISBN 978-1573929790
- Joe Nickell (3 July 2012). The Science of Ghosts: Searching for Spirits of the Dead. Prometheus Books. pp. 283–. ISBN 978-1-61614-586-6.
- Nickell, Joe. "Enfield Poltergeist, Investigative Files". August 2012. Committee for Skeptical Inquiry. Retrieved 3 December 2013.
- Leonard Zusne, Warren H. Jones. (1989). Anomalistic Psychology: A Study of Magical Thinking. Psychology Press. p. 192. ISBN 978-0805805086
- Lange, R., Houran, J. (1998). Delusions of the paranormal: A haunting question of perception. Journal of Nervous and Mental Disease, 186 (10), 637–645.
- Christopher, Milbourne (1970). ESP, Seers & Psychics: What the Occult Really Is. New York: Crowell. p. 142. ISBN 978-0-690-26815-7. OCLC 97063.
A heavy mirror fell from the bedroom wall and an ash tray that had been resting on a table with a glass top slammed against the surface with such force that the glass was shattered.
- Wiseman, Richard. (2011). Paranormality: Why We See What Isn't There. Macmillan. pp. 167-169. ISBN 978-0-230-75298-6
- Lambert, G. W. (1955). Poltergeists: A Physical Theory. Journal of the Society for Psychical Research 38: 49-71.
- Dingwall, Eric; Hall, Trevor H. (1958). Four Modern Ghosts. Gerald Duckworth. p. 105
- Houran, James (2004). From Shaman to Scientist: Essays on Humanity's Search for Spirits. Lanham: Scarecrow Press. p. 11. ISBN 0-8108-5054-0.
- French, CC., Haque, U., Bunton-Stasyshyn, R., Davis, R. (2009), "The "Haunt" project: An attempt to build a "haunted" room by manipulating complex electromagnetic fields and infrasound", Cortex 45 (5): 619–629, doi:10.1016/j.cortex.2007.10.011, PMID 18635163
- Wiseman, Richard. (2011). "The Haunted Brain". Csicop.org. Retrieved 2014-10-11.
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- Fodor, N. (1964). Between Two Worlds. West Nyack, NY: Parker Publishing.
- James Houran, Rense Lange. (2007). Hauntings and Poltergeists: Multidisciplinary Perspectives. McFarland. p. 290. ISBN 978-0786432493
- Allan Kardec, Le Livre des Esprits. (2000). chapter 106, Jean de Bonnot. p.46.
- "Gef the talking Mongoose". DalbySpook.110mb.com. 2010-06-27. Retrieved 2010-04-10.
- Harry Price, The Most Haunted House in England: Ten Years' Investigation (new edition, 1990)
- Spraggett, Allen (Jan 2, 1974). "Pursuing the Elusive Poltergeist". The Pittsburgh Press. Retrieved 4 December 2013.
- Fairley, John; Welfare, Simon (1984). Arthur C. Clarke's World of Strange Powers. London: Harper Collins. pp. 28–31. ISBN 0-00-216679-8.
- "The Stone-Throwing Spook of Little Dixie"
- "WorldWide Religious News-Devil in the detail of Sicily's mysterious village fires". Wwrn.org. 2004-02-11. Retrieved 2009-08-19.
- "Hideous ghost won't stop flushing pub loo – The Star". Sheffieldtoday.net. Retrieved 2009-08-19.
- "Our 'geist bedroom". thesun.co.uk. The Sun. 28 March 2011. Retrieved 30 March 2011.
- O'Shea, Gary (29 March 2011). "Poltergeist wrecks house in Coventry ...and kills the dog". thesun.co.uk. The Sun. Retrieved 30 March 2011.
- O'Shea, Gary (30 March 2011). "See you, Jimmy". thesun.co.uk. The Sun. Retrieved 30 March 2011.
- "The Leaky Cauldron and MuggleNet interview Joanne Kathleen Rowling: Part Two". 2005. Retrieved 2007-06-01.
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- "Poltergeist" caught on video, The Sun UK newspaper, August 9, 2008.
- "The Acoustic Properties of Unexplained Rapping Sounds" Journal of the Society for Psychical Research
- The Poltergeist and his explainers, Andrew Lang, Psychanalyse-paris.com
- International Journal of Parapsychology
- Skeptic's Dictionary