Nasruddin's donkey had given birth but died in labor.
Nasruddin wanted to save the donkey's colt, but that meant giving it milk from the cow, and Nasruddin needed that cow's milk for his own family.
In despair, he prayed. "O God," he cried, "please relieve me of this burden and take the little colt into heaven as you did its mother."
Nasruddin was shocked to discover the next morning that his cow was dead, not the colt.
"O God," he cried, "I don't understand! How is it possible that you can't tell the difference between a cow and a donkey?"
Inspired by: Mulla's Donkey and Other Friends by Mehdi Nakosteen
Notes: This story is on p. 12 of the book.