Knockabout (1979)

Yipao and brother Taipao make a living out of swindling their unsuspecting victims. Before long, their tricks turn sour and they find themselves stripped of cash with nowhere to turn to. Desperate for protection, they scurry under the wing of kung fu master Chia, only to pay a heavy price when they discover their master is a conman with a violent past. Salvation comes in the unlikely shape of Fatty the Beggar, who shows them what real kung fu is all about.