J.M.J. An unknown source offers the following convicting-but-unsurprising occurrence:
"One day during an exorcism, a colleague of Father Gabriele Amorth, S.S.P. (the Chief Exorcist of the Diocese of Rome), heard Satan or one of the demons say, 'Every 'Hail Mary' is like a blow on my head. If Christians knew how powerful the Rosary (is), it would be my end.'"