"I Saw What You Did" is a horror-thriller film originally released in 1965. The movie was directed by William Castle and starred Joan Crawford, John Ireland, and Leif Erickson.
The story revolves around two teenage girls, Libby and Kit, who love to make prank phone calls. One night, they call a man named Steve Marek and say, "I Saw What You Did, And I Know Who You Are!" Unbeknownst to them, Marek has just murdered his wife. Terrified that the girls may know something, Marek hunts them down to kill them.
Meanwhile, Amy Nelson, Marek's beautiful neighbor, has witnessed the murder and becomes the killer's next target. Amy is wheelchair-bound, having been paralyzed in a car accident. She is also romantically obsessed with Marek, despite his violent tendencies.
As the plot thickens, Marek tries to silence the two teenage girls while keeping his crime hidden from his neighbors and the police. He also has to deal with Amy's advances, which become more and more obsessive. Meanwhile, Libby and Kit start to suspect that something is very wrong, and they could be in danger.
The movie was a box-office hit and remains a classic of the horror-thriller genre. It features suspenseful scenes and plot twists that keep viewers on the edge of their seats. Joan Crawford's performance was particularly notable, earning her a nomination for the Best Actress Award at the 1966 Golden Globe Awards.