"That wretched donkey of mine ran away again," said Nasruddin. "If he ever comes back, I'll sell him for a single copper coin!"
The donkey came back, and Nasruddin regretted his reckless oath.
So, he took the cat, who was the donkey's playmate, and put the cat in the donkey's saddlebag. Then he went to the market.
"Buy this fine donkey for just one copper coin!" Nasruddin shouted. "But you must buy the cat too; the donkey would be heartbroken without him."
"How much for the cat?" someone asked.
"The cat will cost you one hundred silver coins," Nasruddin replied.
Inspired by: Mulla's Donkey and Other Friends by Mehdi Nakosteen
Notes: This story is on p. 12 of the book.