Watch American Ultra

Mike, a dimwitted stoner, and his girlfriend spend most of their time watching television and working dead end jobs. When a government agent says a key word that activates repressed memories in Mike's mind, he finds that he is the ultimate killing machine. It's up to Mike, his girlfriend, and a few of his burn out buddies to discover what sort of past life Mike led, while avoiding the government agents who want to capture him and exploit his abilities as the ultimate killing machine.