Ghostly Villain Unmasked by Meddling Kids

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Not really, but it seemed like something that the Mystery Machine might be involved in.

A 42-year-old Polish woman was convicted in January 2005 of harassment after she spent four months pretending to be a ghost in a 15th-century castle.
The owner of the castle had reported doors slamming and other unexplained noises in the middle of the night, and police eventually caught the poltergeist after setting up a video camera.

Police said the woman was apparently motivated by "personal rancour" against the manager of a cultural center at Castel Coldrano. They did not explain exactly what the ghost act was intended to achieve, however.