My wife convinced me to do one of those this year actually - not 23andme, maybe ancestry.com? It's the one where you spit in a tube and mail it in. The results came back 98% Caucasian, northern Europe, and a lot of other stuff that looked like they just randomly made it up to make me feel like they really did something. I told one of my (Mexican) wife's (Mexican) friends that the results confirmed that I'm the whitest white guy in town and he said, "I could have save you $200 and told you that!"