The yakitori rule is the best way to shame those players who think they're so amazing by playing all defensive. PUNISH THEM WITH SHAME!
If you want to formalise the yakitori rule, you should get these little orange markers. You get four (one for each player - generous like that) and when someone wins a hand in a game, they get to turn it over. They don't win a hand, and the orange plastic mocks them.
