The Killers

One morning, hit men Charlie (Lee Marvin) and Lee (Clu Gulager) enter a school for the blind and terrorize the principal until she reveals the whereabouts of a teacher, Johnny North (John Cassavetes). As the hitmen walk toward North's upstairs classroom, the teacher receives a call warning him of their arrival. Johnny sadly responds, "It's okay. I know them." As he calmly waits at his desk, Charlie and Lee enter and shoot him multiple times.