Lao Sun and Xiao Sun go to the market to sell their donkey. They lead the donkey and are laughed at by passers-by. They say that they dont know they should ride the donkey. So Lao Sun ride the donkey, and Xiao Sun follows them. But they are blamed by others; Xiao Sun ride the donkey, and Lao Sun follows them. They are still blamed by the passers-by. In the end, in order not to be blamed by the others, they carry the donkey, and the passers-by began to laugh at them again.