I think it was on 60 minutes or some similar pop news show. A Tai Chi master - one of those ancient white bearded types just like in Kung Fu movies - had an American try punch him to demonstrate how he could channel an attackers energy against him.
The American threw the punch at the Tai Chi master. The master put up an open palm and blocked the punch. But what was remarkable was a split second later the American fell back and looked dazed. They asked the American what happened and he said that after his punch was blocked, it felt like the wind got knocked out of his chest and his legs went numb.