Nothing shocking that I know of, guess my ancestors were boring. Actually, we are descended from one of the signers of the Declaration of Independence. On the other side we're descended from the last anglo saxon king who got conquered by William the Conqueror. Bummer, there goes any relation to any royalty with castles and what not.
I've seen commercials for some type of DNA testing (I think, didn't pay that much attention to it) that can show what someone's background is.