Knockabout (1979) 
What did the kids want to see in the late ‘70s? Comedy kung fu, and Sammo Hung and Jackie Chan delivered. This flick is Sammo Hung’s showcase for he and Jackie’s “Little Brother” Yuen Biao, a wiry, snaggletoothed kid with bad skin who is also one of the most acrobatic, flexible, and funniest screen fighters of all time. With this flick, a star is born.