Foster's Release is a 1971 American short film[3] directed by Terence H.
[4] The film has been credited with inventing many of the tropes of horror later used in films such as Black Christmas, Halloween and He Knows You're Alone.
[5] It is a retelling of the common story of "The Babysitter and the Man Upstairs"[6] about a teenage babysitter who, alone in a house at night, is harassed by a series of phone calls made by a psychotic killer.
[7] The police and phone company cooperate to try to warn the girl and save her.
[9] In Illinois, it is commonly shown to classes in home economics, for whom it illustrates the concepts of responsibility and deviancy.