In the Fist Of Fury (1972), Jackie Chan was one of many extras who played Bruce Lee’s enemies. While filming one of the fight scenes, Bruce accidentally hit Chan’s head with a stick. After finishing the episode, he came up to Jackie to apologize. Chan in his turn actually pretended that his head hurt much more than it really did. The thing is Bruce Lee was his idol and Chan liked the attention. Afterward, Bruce started to pick him out of many other actors and even invited him to be a stunt double in Enter the Dragon.