“Witnesses” (* out of four) was a stupefyingly awful horror thriller about two moronic film-school students (Jesse Howland and Connor Floyd) who decide to shoot their student film in an abandoned warehouse in which they soon find out that a ruthless drug cartel is utilizing this same warehouse for murders and trafficking sex slaves. Floyd’s obnoxious character (and performance) completely sinks this although the film does marginally improve once they get to the warehouse and are pursued. Relentlessly shaky and irritating camera movements may cause you to reach for dramamine.