Mulla, I want to borrow your donkey."
"I am sorry," said the Mulla, "but I have already lent it out."
As soon as he had spoken, the donkey brayed. The sound came from Nasrudin's stable.
"But Mulla, I can hear the donkey, in there!"
As he shut the door in the man's face, Nasrudin said, with dignity, "A man who believes the word of a donkey in preference to my word does not deserve to be lent anything.