It’s strange to think about how different film history would have been without B-movie schlockmeister Roger Corman. Though his own films as a director were rarely any good, he was directly responsible for launching the careers of actors like Jack Nicholson, Dennis Hopper, Sylvester Stallone, and William Shatner. And as a producer he gave a chance to several young aspiring directors such as Martin Scorsese, Ron Howard, Joe Dante, James Cameron and in the case of the film below, Francis Ford Coppola.
Dementia 13 (1963)
https://www.youtube.com/watch?v=MtFQCuuNDLU - from the Cult Cinema Classics YouTube channel (1 hour 14 mins - 1080p)
Synopsis:
Shocked by the death of her spouse, a scheming widow hatches a bold plan to get her hands on the inheritance, unaware that she is targeted by an axe-wielding murderer who lurks in the family’s estate.
Directed by Francis Ford Coppola & Jack Hill (reshoots)
Cast: William Campbell, Luana Anders, Bart Patton & Patrick Magee.
Trivia:
• The film’s title appears on a theater marquee in the Coppola-produced George Lucas film American Graffiti (1973), even though the film was set in 1962, before the theatrical release of Dementia 13.
• Corman wanted a cheap Psycho copy with a Gothic setting, and Coppola quickly wrote a screenplay. Although he was given total directorial freedom during production, he found himself at odds with Corman after filming was completed, resulting in Corman bringing in director Jack Hill to film additional sequences.
And the colourized version if you wish to dabble in such things:
https://www.youtube.com/watch?v=8f-jadVuel0