Donkey Crossing a River With a Load of Salt
A donkey crossing a river with a load of salt lost his footing and slipped into the water, so that the salt was dissolved. He was mightily pleased at finding himself relieved of his burden when he got upon his legs again. So the next time he came to a river with a load on his back, thinking that the same thing would happen if he got into the water, he let himself go under on purpose. But this time he was loaded with sponges, which absorbed so much water that he could not keep his head up and was drowned. (Encyclopedia of Illustrations #474).