Poltergeist

Poltergeists, also known as Boffins in PAL regions, are enemies in the video game Luigi's Mansion: Dark Moon who also serve as mini-bosses during some in-game missions. They are psychic ghost with large craniums.

Luigi's Mansion: Dark Moon
Luigi first encounters a Poltergeist in Gloomy Manor after Professor E. Gadd sent him on a mission to find one in the library. After he manages to enter the room, Luigi finds the Poltergeist playing a piano until the ghost is interrupted by his presence. The Poltergeist attempts to get rid of Luigi by throwing books at him using its telekinesis and tries to hide its position using invisibility. But Luigi eventually succeeds in vacuuming the ghost inside the Poltergust 5000. Later, more Poltergeists appear in the manor during a bonus mission.

At the Old Clockwork, Luigi is forced to track down an Ancient Poltergeist who took the clock hands required to explore the area further. He finds it in the Roundhouse where the Ancient Poltergeist gets assistances from other ghosts to fight Luigi and causes the floor to spin around in the centre of the room. Although Luigi does capture the Ancient Poltergeist, he only obtains one of the clock hands he needs to continue his hunt for the Dark Moon pieces. More Poltergeists eventually appear at the Old Clockworks during the bonus mission.