A Poltergeist (German word meaning "Noisy Ghost") are a more rare form of haunting. They are a ghost/spirit that seemingly come out of nowhere and are intent on expressing themselves by causing a lot of chaos. They have been known to move objects around, stack items, throw things, etc. A poltergeist can last days, weeks, months or years. They go as suddenly as they come.
TELEKINETIC POLTERGEIST:
In many cases, however, another explanation was found...a human explanation. Seems that in many reported cases, there was a teenage girl involved, and they were indirectly causing the activity with their mind and had no idea.