William Castle was a master showman and this was his grandest triumph. He loved a gimmick, in this case Percepto, a device fitted beneath theater seats to enhance the climactic scenes by giving the patrons a short, sharp shock! Vincent Price, at his most maniacally deluded, is a pathologist who says he has discovered fear produces an actual physical creature that only be overcome by the release of a scream. He hopes to get his hands on someone who has died of fright to test his theory and this proves simpler than one might think, thanks to the company he keeps. It is a mad, nightmare of a horro... read the rest.