Performing an exorcism is, not surprisingly, nasty business. You have to shout prayers and throw holy water and pray the satanic being will return to the awful place it came from. However, as you can see from this clip of 'The Devil Inside,' that's not stopping some priests (or, actors who are playing priests) from attempting to learn about them. On the contrary, in this exclusive look at the film, which opens nationwide this Friday, we watch a group taking courses at the Vatican School for Exorcism in Rome. In the crowd is Isabella Rossi (Fernanda Andrade), whose mother, Maria, has been possessed for two decades. Isabella is hoping to find help for her mom, who's currently housed in a psychiatric hospital. As you can see from video, Maria is in pretty rough shape. Good luck to whoever tries to tame that demon!