The Wind In The Wallows by Jeanne Willis
It's an idyllic summer's afternoon down by the stream, the swans are sleeping on lily pad pillows, and nothing stirs except the occasional dragonfly. Then all of a sudden, the peace is rudely shattered by -well - a rip-roaring rippler of stentorian proportions! Outrage prevails and all they can find is one small boy scout, innocently consuming a big tin of beans by the camp fire.