Strangers on a train

Strangers on a Train is a 1951 American psychological crime thriller film with film noir elements, produced and directed by Alfred Hitchcock, and based on the 1950 novel of the same name by Patricia Highsmith. The story concerns two strangers who meet on a train, a young tennis player and a psychopath. On the scene I chose for the illustration you can see the psychopath watching the tennis player on court.