What the Butler Saw is a phrase that relates to voyeurism. The phrase entered British popular culture after the 1886 divorce case of Gertrude Elizabeth Blood. The trial hinged on whether a butler could have seen Blood's adultery through a bedroom keyhole. It can also relate to;
Film What the Butler Saw (mutoscope), a 1900s erotic film shown on a viewing machine What the Butler Saw (1924 film), by George Dewhurst, Edward Mouillot, and Edward Parry What the Butler Saw (1950 film), by Donald and Roger Good, directed by Godfrey Grayson
Other What the Butler Saw (play), 1967 play by Joe Orton, first produced on the stage in 1969, two years after Orton's death What the Butler Saw (TV series), a British reality show "What the Butler Saw" (The Avengers), a 1966 television episode "What the Butler Saw" (The Detectives), a 1993 television episode