The Dog & the Oyster
One day the Dog wandered down to the seashore. There he spied an Oyster. In a twinkling the Oyster was resting in the Dog's stomach, shell and all.
It pained the Dog a good deal, as you can guess.
"I've learned that all round things are not eggs," he said groaning.
Act in haste and repent at leisure — and often in pain.