I tried to post this same comment… regardless, holy shit, seriously??!!?? Kesey swore that he would never watch the film version, and never did, according to my good sources.

One Flew Over the Cuckoo's Nest?
How could you leave this off? He swore he would never see it and never did, regardless of how critically successful it was. He did, however, participate heavily in the making of the film adaptation of "Sometimes A Great Notion" and loved that film.