It's summer, the two siblings are playing outside. One day, brother found a pile of "poopoo" on the ground and called big sister to come. The sister came up with a good idea, they planted the "poopoo" into the soil together. In a short time, little buds sprouted from the place where they were planted, growing taller every day, sprouting leaves and vines ...... and finally --surprisingly, a large watermelon grew up. They were happy, the brother wanted to carry the watermelon home, but he fell to the ground and broke the watermelon. What will they do? They decided to make "poopoo" too - they keep planting the "poopoo" in the ground!