This idiom means. When the body is not small also played a prank that this expression is wildly. Their interesting because. Taking the nature of I afraid of cats were compared by comparing the cat as adults, compared to me is a little.When the cat's away, the mice will play. "The cat I on the roof." that's when the adults away. Small played widely frenzy, fun, and when adult back the panic. Clean it up things and places to stay in a normal condition. As if nothing had happened.