In his autobiography "I am Jackie Chan" Chan related a story from his youth where he and his fellow Peking Opera Students (including Yuen Wah) were forced to do hand stands for hours on end. One time they were doing them and then the master yelled "Stop!" and all the boys dropped to the ground, except Yuen Wah. The teacher and students went over to see why and found he had fallen asleep, while maintaining a perfect hand stand.