Anyone who has ever wished an annoying person in their life would just disappear will vicariously enjoy Graham Marshall (Cain) in the sardonic comedy "Shock to the System" who, belittled at home and passed over at the office, decides to take control of his destiny by eliminating those interfering with his happiness. Self narrated by Cain, often in the third person to impart a sense of detachment, the film manages to make the murderous Marshall both hero and villain as he courts a lovely secretary (McGovern) while befuddling a nosey homicide investigator (Patton). Cain's performance makes this otherwise mediocre film well worth watching. (B-)