We often joke about how we might be related to Charlemagne. We do that because we have seen so many trees (probably of RootsWeb) that show the author's ancestry going back to him.
Well, it may be that if you are of European descent, there is a distinct probability that you are related to him.
Dick Eastman gives an insight into the reasons in his online newsletter. You can find the article at http://tinyurl.com/y85w9xg.