Ok, to continue in this week's potentially racist theme, tonight I learned from a young Japanese woman who is currently visiting the US that "all Japanese girls" ask potential boyfriends what their blood type is. Apparently, similar to astrology here in the US, there's a belief in Japan that your blood type reflects what your personality will be.
You can read all about it in more detail here in this Wikipedia article. And, coincidentally to fit this week's theme, in the first paragraph of the Wikipedia article, they say this blood-type fortune telling is a form of racism.