A boy found a cocoon on the leaf of a tree. He took the cocoon and put it in a jar. One day the boy and his father saw the soon-to-be butterfly starting to gnaw its way out of the cocoon. In anticipation, the father took the cocoon and started to tear it open so the butterfly could get out quicker and more easily. He tore the cocoon open, took the newly emerged butterfly out of it, and put the butterfly in the jar. The butterfly's wings were all shriveled up. The boy and his father waited for the butterfly to straighten out it's wings. To their dismay, the butterfly's wings never straightened out, and they were all shriveled up thereafter. The new butterfly was disfigured and deformed.

You see, when the butterfly gnaws a hole in the cocoon and squeezes through it, the fluids in the butterfly's body get squeezed into the wings, and the wings get straightened out from the pressure of the butterfly's squeezing its body through the hole. By the man's tearing open the cocoon and taking the butterfly out, the butterfly could not squeeze the fluids into the wings and straighten them out.