It’s a Wonderful Life (1946)
An angel is sent from Heaven to help a desperately frustrated businessman by showing him what life would have been like if he had never existed.
Director: Frank Capra
Writers: Frances Goodrich (screenplay), Albert Hackett (screenplay), Frank Capra (screenplay), Jo Swerling (additional scenes), Philip Van Doren Stern (story)
Honestly, I don’t think I’ve ever seen anything quite like It’s A Wonderful Life.