I get asked this a lot, and I'm not mixed. It's because of my hair, skin and maybe the way I speak ( I get the oreo label a lot). My parents are black--I'm light skinned probably because my mom is. I have some Irish and Cherokee mixed in from a long time ago but most blacks in America have a little mix of everything somewhere down the line.
Lately I've started coming up with ridiculously impossible combinations. Conversations usually go like this:
Guy: "Say guh, you mixed?"
Me: "Why yes, I'm Japanese and Russian."
It's scary when they actually believe me.