Once upon a time there were a fisherman and his wife who lived together in a shack that was so filthy it might as well have been a pisspot. Every day the fisherman went out to fish, and he fished and he fished. One day he sat there looking down into the clear water, and he sat, and he sat, and his line went all the way down to the bottom of the sea. And when he pulled it out, there was a great big flounder on the hook.
The flounder said, "Now look, fisherman – what about letting me live, eh? I'm no ordinary flounder. I'm an enchanted prince. What good would it do you to kill me? I wouldn't taste nice at all. Put me back in the water, there's a good fellow."
"Fair enough," said the fisherman. "Say no more. The word of a talking fish is good enough for me."
And he put the flounder back in the water, and down it swam to the bottom, leaving a long trail of blood behind it.
Then the fisherman went back to his wife in their filthy shack.
"Didn't you catch anything today?" she said.
"Oh, yes," he said. "I caught a flounder. A great big ‘un. But he told me he was an enchanted prince, so I let him go."
"Typical!" said the wife. "Why didn't you ask him for something?"
"I dunno," said the fisherman. "What should I have asked for?"
"Those enchanted princes can do anything," said the wife. "And look at this shack. It stinks, the rain comes in, the shelves keep falling off the walls; it's a terrible place to live. Go back and call that flounder up and tell him we want a nice cottage, all clean and neat. Go on."
The fisherman didn't really feel like doing that, but on the other hand he knew what would happen if he didn't do what his wife wanted, so back he went to the seashore. When he got there the water wasn't clear any more, but dark green and murky yellow.