Debbie Moon at 2013-04-07 17:03:57:
There's a short story by MR James called The Mezzotint, about an academic who buys an engraving of a country house, only to watch in helpless horror as a tragedy that occurred there plays itself out in the engraving.
Could we use an old camera to create a similar story? An ancient Polaroid camera found in the attic of someone's newly bought house starts to produce a photo (say) every twelve hours - despite having no film in it. impossibly, the pictures show the new owners of the house - and ultimately accelerate to showing them being horribly murdered. Can they avoid the fate the camera predicts ?