A poltergeist is a paranormal phenomenon which consists of events alluding to the manifestation of an imperceptible entity. Such manifestation typically includes inanimate objects moving or being thrown about, sentient noises (such as impaired knocking, pounding or banging) and, on some occasions, physical attacks on those witnessing the events.
While no conclusive scientific explanation of the events exists up to this day, poltergeists have traditionally been described in folklore as troublesome spirits or ghosts which haunt a particular person. Such alleged poltergeist manifestations have been reported in many cultures and countries
Poltergeist activity has often been believed to be the work of malicious ghosts. According to Alan 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).
In parapsychology, Nandor Fodor proposed that poltergeist disturbances were caused by human agents suffering from some form of emotional stress or tension. William G. Roll studied 116 different poltergeist cases and found that the agents were often children or teenagers, and supposed that recurrent neuronal discharges resulting in epileptic symptoms may cause recurrent spontaneous psychokinesis (RSPK), which would affect the person's surroundings.The case of the Rosenheim Poltergeist, where none of the disturbances could be explained via physical means, was suggested to be caused by psychokinetic forces.
The Enfield Poltergeist
The activity occurred at Enfield in North London, at 284 Green Street, a council house rented to Peggy Hodgson, a single parent with four children.
During this time furniture is said to have moved by itself, knockings on the walls were heard, and children's toys were said to have been thrown around and to have been too hot to touch when picked up. A police officer signed an affidavit to affirm that she saw a chair move. Reports of the activity attracted various visitors including mediums and members of the press. One photographer reported being hit on the forehead with a Lego brick. After visiting the house, George Fallows, a senior reporter for the Daily Mirror, suggested that the Society for Psychical Research (SPR) be called in to investigate.
The incidents were duly investigated by Maurice Grosse and Guy Lyon Playfair, both members of the SPR, who were convinced by the evidence which they encountered during their thirteen month investigation.
The family in the Enfield case consisted of a mother, two daughters and two sons; Margaret aged 12, a younger sister Janet aged 11, Johnny aged 10 and Billy aged 7. Billy had a speech impediment. Johnny featured only marginally in the inexplicable events, at least 26 of which the investigators considered could not be accounted for by fraud. These included moving furniture, flying marbles, interference with bedclothes, cold breezes, pools of water on the floor, apparitions, physical assaults, graffiti, equipment malfunction and failure, disappearance and reappearance of objects, apparent levitations, and fires which spontaneously ignited and extinguished themselves.
Among other alleged phenomena they witnessed was Janet speaking using her false vocal folds for hours on end while she was apparently possessed by another entity. Speaking in this way is believed to be medically impossible. When speaking with the false cords Janet said she was "Bill" who had died in the house of a brain haemorrhage. The "Bill" persona habitually made jokes and exhibited a very nasty temper, swearing at Maurice, once calling him a "f...... old sod". Grosse was contacted by a man who claimed to be Bill's son. Recordings were made of these occurrences. After the BBC went to the house the recording crew found the metal inside of the recording machines bent, and recordings erased.
Grabbed From The Wikipedia