Poltergeist

In folklore and the paranormal, a poltergeist is the apparent manifestation of an invisible but noisy, disruptive or destructive entity. Most accounts of poltergeist manifestations involve noises and destruction that have no apparent cause. Reports also include inanimate objects being picked up and thrown as if by an invisible person; noises such as knocking, rapping, or even human voices; and petty physical attacks on human beings, such as pinching, biting, and hitting.