The film's nightmare premise grew out of an unsettling real-life experience described by co-writer Michael Ronald Ross. In 1969, Ross brought a hitchhiking hippie named Donna to the Laurel Canyon home he was subleasing from singer-songwriter Harry Nilsson. What began as a temporary act of hospitality turned into an invasion of the household: she lingered, left candle wax around the property, telephoned an assortment of strange people, and reportedly burned nearly every spoon in the kitchen while cooking drugs. Ross eventually got her to leave at a friend's house—someone he described as an alleged drug dealer—but the ordeal continued when she later contacted him and asked him to serve as a character witness for her parole officer. The real Donna departed without the violence that defines the movie, but her behavior became the seed for the screenplay's two unwelcome female intruders, and the name was retained for one of the characters. The story is not a supernatural Hollywood legend; it is an unusually direct example of an ordinary domestic nuisance being transformed into exploitation cinema.
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