Editor's note: Some of the voices you hear in this video may be unsettling. The alleged gunman in the Seattle Pacific University shooting last week heard the voice of one of the Columbine killers inside his head, according to court records. Have you ever wondered what it would be like to hear voices in your head?CNN's Anderson Cooper used a simulator to experience what it's like to have schizophrenia. For more information please visit http://www.hlntv.com/video/2014/06/11...