原来还真有日本黑帮历史学家啊,他出来讲解了:
Because of the history as a feudal organization the Yakuza have a close association with Bushido, which the way of Samurai. And that, heavily forms a lot of The Yakuza's ceremonial、aspects、even punishment techniques. The most commonly known punishment is to cut off your tips of your small finger. And presented to your boss or your family head as the demonstration of their tournament.
因为在以前日本的封建社会历史里面,黑帮组织跟武士道有着很密切的联系,所以黑帮的纪念仪式、观点甚至刑罚方式,都有很深的武士道烙印在里面。而其中最为人所熟知的惩罚方式,便是将你的小指头割断,然后展示给你的上司或是你的家人