Knockabout (1979)

Little and big John make a living out of crooked exploits and swindling. Their tricks turn sour when they find themselves stripped of cash with nowhere to turn. Desperate for protection, they scurry under the wings of 'Silver Fox', only to pay a heavy price when they discover their master is a con man and a murderer. Salvation comes in the unlikely shap of Fatty the Beggar, who shows them what real kung fu is all about.