The Voodoo Ball) is a 1973 Spanish-French dystopian science fiction/crime/horror film directed by Eloy de la Iglesia and starring Sue Lyon, Christopher Mitchum and Jean Sorel.

The plot follows a respectable nurse, who seduces young men, takes them home to bed, listens to the post-coital beating of their hearts, and then stabs them to death with a surgical scalpel.

[3] Anna Vernia, a beautiful young nurse, receives a medal of recognition for her outstanding dedication to her patients at the medical center where she works.

Victor is deeply involved in a project that employs electro-shock therapy in violent criminals in an effort to turn them into model citizens.

A family is getting ready to watch Stanley Kubrick's A Clockwork Orange on television when they are assaulted by a gang of delinquents who knock at their door.

The assailants, wearing red helmets, leather biker's outfits, and handling bullwhips smash the modern looking apartment.

Wearing a wig and dressed matronly, Anna seduces Bruno, a narcissistic underwear model, who she has seen on TV commercials.

David buys a motorcycle with the money, but the members of his former gang, who believe he has stolen a bounty from them, pursue him and leave him badly beaten.

The original Spanish title Una gota de sangre para morir amando translates as A Drop of Blood to Die Loving and the film was theatrically released in France as Le bal du vaudou and in the United States as To Love, Perhaps to Die with the latter title a closer translation of the Spanish.

[4][5] In the mid-1980s Empire Video released the film on UK VHS as Clockwork Terror in an attempt to sell it almost as a sequel to A Clockwork Orange and its following British video and DVD releases were titled Murder in a Blue World in reference to the fictional Blue Drink featured in the film.

[8] Like its inspiration source the film is set in a near-future dystopian world where sadistic gangs attack, rape and steal from innocent people on the streets and in their homes.

[9] To elaborate, the film plays on the Ludovico Technique of its predecessor as a neo-Fascist government tries to fight these crimes by conducting sinister mind-control experiments on captured criminals.

A family are seen settling down to watch a television broadcast of the film (with introductory onscreen images of Kubrick), just before their home is invaded and they are assaulted by a Droog-like gang.