I was watching one of his interviews about him first coming to America to do films, he said he met someone who was really good at stunts and asked him how he did it; the guy replied, " I jump 1 feet, then they press a few buttons and wala, I just jumped over a building, how do you do it Jackie?"
He replies : " easy, they call action, I jump, they call cut, and then I go to hospital." lolololol