Freaky Friday is a 1976 American comedy film starring Jodie Foster as Annabel Andrews and Barbara Harris as her mother. The film is based on the novel of the same name by Mary Rodgers, in which mother and daughter switch bodies and get a taste of each others' lives. The cause of the switch is left unexplained in this film, but occurs one Friday the 13th, when Mrs. Andrews and Annabel, in different places, say about each other at the same time "I wish I could switch places with her for just one day." Rodgers added a waterskiing subplot to her screenplay. The cast also includes John Astin, Ruth Buzzi, Dick Van Patten, and Charlene Tilton.