McMurphy’s rebellion against the paltry rules that govern the ward throws everybody into an uproar. Patients respond with warmth as they suddenly realize they’ve been dead all these years, lulled into a false sense of security by allowing others to control their every waking moment – and, well, their sleeping moments, too. Rebellion turns out not to be a lighthearted game, but a serious struggle in a life or death situation.
Although Nurse Ratched argues that McMurphy’s "rebellion" is evidence of his insanity, rebellion against petty rules and regulations is actually a healthy response to tyranny.