Once upon a time there was a pond that hummed and buzzed happily. But then the frogs suddenly appeared. They greedily filled their mouths with everything within reach of their tongues. They even snatched their prey from the mouths of the others. Then, just as suddenly, calm returned. The great snapping was over. Fully eaten frogs floated contentedly on the water. But every now and then a strange noise could be heard that sounded as if something was bursting somewhere.