Cause and Effect

Over the weekend my sister-in-law and I were talking about the kids growing.  Their boys are all slightly on the smaller side for their ages, and she said they told the boys their only jobs this summer were to eat and sleep.  (Eating + sleeping = growing.)  Alex was sitting with me and he asked me why they had those jobs.  So I asked him what he thought happened when you eat and sleep.  "Ummm...you get crumbs in your bed?"