Fletcher picked up the Academy Award for Best Actress for her terrifying portrayal of Nurse Ratched in the 1975 cult classic, starring Jack Nicholson as a patient in a mental asylum.
Despite the acclaim she received for her performance, Fletcher admits she can't bring herself to watch the film due to her character's behaviour - especially when she has Nicholson's Randle McMurphy lobotomised.
She tells the Associated Press, ""I find it too painful. It comes with age. I can't watch movies that are inhumane. I was really shocked in those scenes where I was actually so cruel.""