In a milking competition, the referee held a big iron bucket and said to the contestants: "Whoever can fill a bucket within one minute will be the champion, and the prize money is 500 yuan!" After that, there was a "beep" and the competition began. Within a minute, a burly man panted and picked up the milk bucket and shouted: "Report, I filled a bucket!" Everyone was happy for the big man. The referee took a look and pointed to the back and said: "The champion should be given to the little girl at the back." Everyone saw that the little girl had only squeezed less than half a bucket, so they asked the referee why he gave the championship to her. The referee said: "She was milking a bull!"