In folklore and parapsychology, a poltergeist (German for "noisy ghost") is a type of ghost 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 have been widely reported in cultural folklore, and have traditionally been described as troublesome spirits who haunt a particular person instead of a specific location. 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 Other theory is that poltergeist activity can be caused by an adolescent teenage girl going through puberty stages. During this stage of development, a young girl can harbour an extreme amount of inner energy. This energy can be projected with the mind, which can cause tapping sounds, the movement of objects, lights flickering off and on.