http://reddit.com/info/27hl3/comments/c27it4
"You can call yourself "white" all you want, but if you're 3/4 (white) German and 1/4 (black) Nigerian people in the US are going to call you black.
You would refer to yourself as black because calling yourself white would result in confusion, or worse."
...
The new girl at work is so pale and keen-featured she could almost pass for white. I refuse to get near the topic, but I imagine that if I identified her as a black person, we would have to have "that discussion"--the one where many really light-skinned blacks or mixed people like Tiger Woods gives me a lecture on identity.
And I would laugh because I would say to her "you know, white folks think you're black, and they run the country. So while I'm glad you took the time to think it through, and have exposed your obvious intelligence, it really doesn't matter."
And then she would never go out to lunch with me again.