I Saw What You Did

I Saw What You Did
Original theatrical poster
Directed by	William Castle
Produced by	William Castle Dona Holloway
Screenplay by	William P. McGivern
Based on	Out of the Dark by Ursula Curtiss
Starring	Joan Crawford John Ireland Leif Erickson
Music by	Van Alexander Jerry Keller
Cinematography	Joseph Biroc
Edited by	Edwin H. Bryant
Distributed by	Universal Pictures
Release date	July 21, 1965 (1965-07-21) (USA)
Running time	82 minutes
Country	United States
Language	English
Box office	$1,000,000

I Saw What You Did is a 1965 American horror film released by Universal Pictures and starring Joan Crawford and John Ireland. The plot follows two teenage girls who find themselves in serious danger after making a prank phone call to a man who has just murdered his wife. The screenplay by William P. McGivern was based upon the 1964 novel Out of the Dark by Ursula Curtiss. The film was produced and directed by William Castle.

When two mischievous teens Libby (Andi Garrett) and Kit (Sara Lane) are home alone with Libby's younger sister Tess (Sharyl Locke), they amuse themselves by randomly dialing telephone numbers asking prank questions, telling whomever answers: "I saw what you did, and I know who you are." Libby places a call to Steve Marak (John Ireland), a man who has recently murdered his wife, Judith (Joyce Meadows) and disposed of her body in the woods. Believing he has been found out, he decides to track down the caller to silence her.

Marak's neighbor Amy (Joan Crawford) is in love with him and has been trying to woo him away from his wife. She finds out about the murder. Libby fatefully decides to get a look at Marak because she was intrigued by his voice and takes an increasingly frightened Tess and Kit in her parent's car to Marak's address. Amy discovers Libby and chases her off, thinking she's preventing Marak from meeting with a younger lover but inadvertently saving the girl from being murdered by Marak, who has seen her and grabbed a knife. Amy also snatches Libby's mother's car registration from the car seat before Libby drives away, and gives it to Marak, telling him to keep it as a souvenir, his last "Suzette" (meaning involving himself with a much younger woman like his deceased wife). Amy tries to blackmail him into marrying her, telling him she knows about his wife, but he stabs her to death after they have a drink. Libby's mother's identification has the family address and phone number, which Marak then uses to track down the girls. He calls asking if her parents are home. She innocently answers no, and he sets out to her home.