The man who first finished drawing and took the goblet ready to drink. He held the goblet in his left hand and continued drawing with his right hand. He said, "I can add feet to the snake, too!" Before he added, another guy finished his drawing and snatched the goblet from him, said, "Snakes have no feet naturally, how could you add feet to the snake?" So, another guy drank the wine. At last, the wine failed the man who added feet to the snake.

PS. The story teaches us three lessons: 1. Dont do anything unnecessary; 2. Respect the objectivity of a fact and do the right thing rightly 3. Have a clear goal when you do something; never let triumph dazzle your brain.