Knockabout

Hong Kong action comedy directed by Sammo Hung, who also stars.

Con artist brothers Yipao (Yuen Biao) and Taipao (Leung Kar-yan) are cheated out of their profits by Silver Fox (Lau Kar-wing).

When they try to fight him they are defeated and so they ask him to train them to become better fighters.

Yipao discovers that Silver Fox is a killer and is attacked, but Taipao blocks the fatal blow and is killed instead.

Vowing revenge, Yipao finds a beggar (Hung) skilled in kung fu and trains with him so that he can become skilled enough to kill Silver Fox.