A poltergeist (German for noisy ghost) is an invisible entity that moves objects and causes electrical malfunctions by telekinesis. Doing so classifies them as (inter)active spirits, in contrast to non-interactive ones which engage only in minimal action such as showing themselves. Poltergeister (German plural) are mischievous beings, and connected to an object (usually a building) or a person. The haunting by a poltergeist is called infestation. Most classic poltergeist stories and (presumably) incidents originate in England.
Famous (said-to-be) poltergeist infestations :