http://en.wikipedia.org/wiki/Enfield_Poltergeist
?
not the most convincing take on it . . .
a pro website says:
' Attempts by researchers to prove once and for all the existence of such phenomena failed time after time to actually collect good solid evidence of the events in Enfield. In one instance, a toy brick was said to have materialised out of thin air, flew across the room and hit a photographer on the head. Many items were found to catch fire on their own accord, while metal items seemed to bend and twist out of shape. Most disturbing of all, was the apparant possession of 12 year old Janet, from which came a deep gruff voice on many occassions.
Janet was also reported to have been constantly levitated out of bed at night by an unseen force, effectively trapping her on the ceiling in some cases. To this day the sheer length of time over which these phenomena occurred baffles researchers. This is considered to be a true "classic" poltergeist case.'
but of course it was never verified - so hardly convincing