These days I see a lot of silly people, who believe blood type influences on the person's character.
It's based on a book by a Japanese many years ago. There's no scientific proof for such a conclusion but just a statistics of some Japanese ppl.
I can find a number of sites of blogs about blood type & temper where they say like this.
People of blood type A are
introvert, sensitive, timid, good-looking, boring spouses, not active and bold
they always think of others,
When someone gets angry or upset, they feel sorry even if it's not their fault.
People of blood type B are
active, adventurous, creative, energetic, free in action
egoistic, freak, rude, not hansome or pretty but unique and charming,
no good spouses cuz they are all play boys or play girls.
People of blood type AB are
stupid or genious, cold, rational, unsociable, rigid
cunning, egoistic, not pretty or hansome but polished
psychotic spouses
People of blood type O are
good leaders, generous, curious, active, passional, rash
arrogant, aggressive, violent, have too strong self prides
want others to obey them.
as pretty as Barbie doll.
It's more stupid that some young women judge a man only by his blood type, even though they haven't meet him before, just like "He is B , so he must be a rude playboy. I won't meet him." or "O is my favorite type, and I'll be friends only with O type boys "
Can you believe these above? You think it make sense?