Experiences with a poltergeist -- or "noisy spirit" -- can range from annoying to terrifying. Poltergeists can be playful, mischievous or downright malevolent. No one knows for certain what causes poltergeist phenomena, but most researchers suspect it is a psychic phenomenon, centered around a person, rather than a true ghost or spirit. Here are some true cases.
The activity begins when a blanket is swiped in the middle of the night.
A poltergeist seems to be messing with the bedroom dresser.
When a girl knocks on a wall, there's an immediate response from someone knocking in the basement.
Poltergeist activity is accompanied by strange balls of light.
Yes, that's right, a lawn chair, and it happened during a camping trip.
This poltergeist shook an entire house, almost to its foundation.
A poltergeist makes a mess of Jay's room.
A strange face appears on a man's TV screen in a threatening way.
It starts with pennies being thrown from nowhere, then the sound of billiard balls.
A drop of blood appears from nowhere, followed by unexplained knocks.