People in most parts of the world do not think about their blood group much, unless they have an operation or an accident and need a transfusion.
But in Japan, whether someone is A, B, O or AB is a topic of everyday conversation.
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The received wisdom is that As are dependable and self sacrificing, but reserved and prone to worry.
Decisive and confident - that is people with type O.
ABs are well balanced, clear-sighted and logical, but also high-maintenance and distant.
The black sheep though seem to be blood group B - flamboyant free-thinkers, but selfish.
"At the interview for my first job they asked me about my blood type," said a man with blood group B, who wanted to identify himself only as Kouichi.
"The surprise was written on my face. Why? It turned out the company president really cared. She'd obviously had a bad experience with a B type blood person. But somehow I got the job anyway."
Later, though, the issue of his blood came up again.
"The president was the kind of person who couldn't take her drink and at one company party she got drunk. So she sent B people home before the others. 'You are blood type B,' she said. 'Get out.'"
There is even a term for such behaviour in Japan, burahara, which translates as blood group harassment.
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"This particular thing about blood types is a clever way of telling people what you think about them, but indirectly," said Jeff Kingston, professor of Asian Studies at Temple University in Japan.
"Here people don't like to be upfront and open about their opinions. So if you can hide behind blood types you can then tell someone indirectly what you think about them."
http://news.bbc.co.uk/2/hi/asia-pacific/8646236.stm