Fei tou mo nu (1982)

Yu Chun and her two loyal servants are deep in prayer when an evil sorcerer appears. He puts a curse on her, which causes her head to periodically detach from her body, fly through the air and attack those around her. Attempts at exorcism and removal of the sorcerer's poison are unsuccessful, and Yu Chun is forced to live with the knowledge that once a month her head will take on a life of its own and wreak havoc. Years later, another meeting with the sorcerer offers a chance to break the curse once and for all.