The word 'poltergeist' literally translates from German as 'Noisy Ghost' or 'Noisy Spirit'. Poltergeists are described as being an unwelcome, malevolent,
disruptive, mischievous, and noisy paranormal entity.
This type of paranormal phenomena has been reported since medieval times and up until the present day. Some scientists even acknowledge this phenomenon and are debating the causes of Poltergeist activity. Some poltergeist characteristics include thrown or moved objects, foul odours, loud unexplained noises, loud banging, and unexplained electrical disturbances.
One of the most famous poltergeist cases in the UK was the Enfield Poltergeist case which you can search for online.