The part of California that I lived in, there were a lot of South and Central American immigrants. I for never once had doubted that I look anything else than a pure bred Indian. However, I had a tough time acting dumb with strangers who would break out into a long Spanish rambling with me, assuming that I am of South American origin! The problem had become so bad, that I actually had to learn to say "Na Habla Espanol" to let the people know that I do not speak Spanish!
The past year had been relatively great, and I no longer had to prove my Indian identity. Since the new year however, I have been asked at least by a dozen people in my college hostel if I am "Persian"?!!
Now that's kinda funny. My mirror shattering looks can actually get me into half a dozen countries in the world without being looked at as a foreigner :) !!