Ron Graham was amazed that an elderly and seemingly frail Paul Erdos could easily beat him (may have been those damned amphetamines again!). So he (Graham) bought a ping pong serving machine, and eventually became the table tennis champion of Bell Labs (he's also an expert juggler and trampolinist). I think his wife Fan is also a killer player.
He's 5 years old and can barely reach over the table. But, he's able to back up 10 feet from the table and hit absolutely huge returns. I was able to beat him, but he definitely scored lots of points on me. Given that I'm rated about 750, this is crazy!
Give him a few years and he'll be playing pro in no time.