There's also a scene that an the "oyabun" (absolute leader of a yakuza clan) use gun to kill one man who did not complete a mission, but instead of shooting into his head, the oyabun gave the man his coat, and shoot to the back. It turns out that the coat is bullet proof, and the oyabun actually allow that man to live a normal life thereafter.
Watching that movie make me absolutely want to fight someone with my bare hand (I know I shouldn't).