A satanic servant, jealous of his master’s life of mondo sex and monstrously endowed women, takes over his boss’s estate by means of witchcraft and enchants the housemaids into murderous mayhem in Blue Blood (1973). The bewitching midnight shades of mam-flashing madness are guaranteed to give you blue balls among the bloodshed. In this case, the butler did it . . . with everyone in the house.