Inspired by an alleged real case of demonic possession in 1949, The Exorcist became an international phenomenon on its release in 1973. A blockbusting adaptation of a best-selling novel, it was praised as 'deeply spiritual' by some sections of the Catholic Church while being picketed by the Festival of Light and branded 'Satanic' by the evangelist Billy Graham. Banned on video in the UK for nearly fifteen years, the film still retains an extraordinary...