In the climactic scene of “One Flew Over the Cuckoo’s Nest,” Billy Bibbit, a likeable but painfully withdrawn young male patient in a mental institution, finally seems to be emerging from a lifetime of crippling anxiety, depression and suicide attempts, speaking boldly and without stuttering for the first time. As the other patients good-naturedly cheer Billy on, the cold and malevolent head administrator, Nurse Ratched – perversely threatened by Billy’s new-found freedom and independence – manipulates him right back down into the depths of his mental dungeon. He pitifully sinks to the floor, stammering and screaming, as the guards drag...