One of Ingmar Bergman's most beloved films has Liv Ullmann as an actress who mysteriously clams up and stops speaking in the middle of a performance. She doesn't start again, so she's sequestered at home with a very young and chatty nurse, who does the talking for both of them. Her youth and sub-surface psychosis bring about strange conversation topics, until things (of course) come to a head. Despite some slow going, Persona is unlike any other film you're likely to see. Give it a whirl.