A legend about the Li family is that those who are the directly descended from rebel Emperor Zhuanxu have a genetic trait noticeable in their feet. The last toe on each foot would be pointing inward a little rather than being straight like the rest of the toes. In addition, the nail on this foot has two sections, with one section appearing to override the other. This distinguishes the “true” Lis from the other families with the name as they were born with perfect feet.

http://en.wikipedia.org/wiki/L%C7%90_(%E6%9D%8E)_(surname)

Unfortunately, only my right foot is like this.