Can you please explain why the heck Japanese are so interested in my blood type? I can’t tell you how many times I’ve been in a normal social situation and someone asks if I’m type O or whatever. I don’t mind so much when it’s a pretty woman posing the question, but it does strike me as a weird thing to ask, especially of someone you’ve just met. And they always seem taken aback when I say I have no idea. But why should I know my blood type? I’ve always been healthy.