Japanese Blood Types and Personality - Issendai's Lair
http://www.issendai.com/rpgs/takemywings/bloodtypes.htm
"thanks to a remarkable bit of Science! by a gentleman named Furukawa Takeji, the Japanese believe that a person's blood type affects their personality."
Anil Dash: How to kill a personality
http://www.dashes.com/anil/2006/12/22/how_to_kill_a_p
"what I see right now is the depressing reality that everybody can be completely reasonable, and the end result is that nobody is allowed to show the most engaging, interesting and unique parts of their personality."