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Japanese gangs are really hardcore. If you mess up once, you'll need to pay the price. This often involves having to chop off a part of your finger and presenting it to your boss.

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Once you realize that even slight tardiness can be considered as a huge offense, you'll start to understand why so many Japanese gang members have missing finger joints.

In Japan, only gang members have tattoos. Normally it can also be considered a basic requirement. Also those aren't traditional tattoos made using a machine. Those are carved into the skin using a stick over a period of several months or even years.