I Learned It on Wikipedia
Using mathematical models, it is easy to demonstrate that every human being alive today is likely to be a direct descendant of Confucius, even using mathematical models that assume an extremely small amount of cross cultural mating, since any human alive today would have had 1.5 sextillion ancestors alive at the time of Confucius, over a quadrillion times more than the population of the earth at the time, making descent from Confucius a mathematical certainty, even accounting for consanguinity and geographical and cultural barriers, as noted by Yale professor Joseph T. Chang.
Seriously? Are we all direct descendants of every individual living at that time? Or of every individual who managed to leave descendants? I find it hard to believe, but it would be excellent if it were true.