This 1940 romantic comedy, starring Margaret Sullavan and James Stewart, is the film on which director and co-screenwriter Nora Ephron based her 1998 comedy You’ve Got Mail, in which Meg Ryan and Tom Hanks play bookstore rivals who detest one another at work, but unknowingly correspond anonymously and flirtatiously via email at night. In this 1940 movie, their correspondence took place through the U.S. mail, and took a lot longer – but the influence of that film is obvious when looking at You’ve Got Mail. For one thing, look closely at this picture from You’ve Got Mail, and see the name of Meg Ryan’s independent bookstore.