I Will Finally Knock You Down, Dad!
There is an underlying story about a lazy son who knows some kung fu but mostly fakes it to show off. After being exposed he does good by improving his skills to the point where he can finally knock down his kung fu master father.
Directors: Hsu Hsia
Writers: Chia Yeh, Jan-Wing Chow, Yao-yung Kwan
Cast
IMDB: tt0088376