At this point, we have all witnessed exorcisms taking place. Fictional ones, of course, but nonetheless, horror fans, and those poor souls that we have dragged to the movies with us, have all witnessed a young priest and an old priest, reciting the Rites of Exorcism over a writhing, spitting, tormented man, woman, or child. We’re scared but we know it's not real. We know they are playing characters in a movie. But how would you react if you were watching a real person go through it all? Well in April of 1991, ABC viewers were faced with that very question when “20/20” aired the live exorcism of a teenager known only as “Gina.”