Today we explore the true story behind "The Conjuring: The Devil Made Me Do It." The infamous trial of Arne Cheyenne Johnson, also known as the "Devil Made Me Do It" case, is the first known court case in the United States in which the defense sought to prove innocence based upon the defendant's claim of demonic possession. But long before the trial there was a paranormal event that lead Ed & Lorraine Warren to get involved. The Warren's would do their best to corroborate the story based on their experiences. They truly believed that Arne was possessed by a demonic force. Mystery Archives video.