Mgr. Corrado Balducci in Saint Peter's square at the Vatican in Rome on March 2001. Balducci (1923-2008) was one of the world's leading experts on exorcism and demonology. He has practised exorcisms and written numerous books on the subject of diabolic possession; the subliminal messages in rock and metal music and extraterrestrials. Considered one of the greatest authority on exorcism Monsignor Balducci often appeared on Italian TV to talk about satanism; religion; and extraterrestrials. Photo : Eric Vandeville/akg-images