One day, Ella is jumping rope. Jacky comes over and asks, "Ella, how many jumps can you do at a time?" "About 30," answers Ella. Jacky laughs at her. He says, "Are you kidding me? Just 30?" "Jacky, it's easier said than done. Now you jump. I count." Jacky takes the rope and jumps. He does only 20 jumps! Now it's time for Ella to laugh.