After all this time - 45 years - I finally watched this movie. I've never seen hours fly past so quickly. Absolutely riveted by, not only the performance by Jack Nicholson, but also the entire cast, and especially Louise Fletcher as the chilling and manipulative Nurse Ratched. The reduction at the end of the fragile Billy (played by Brad Dourif) by her was bad enough but seeing what happened after made me homicidal towards her as well. Stunning drama with some fabulous comic interludes. The ending was both gut wrenching and soaring.