One day Mullah Nasruddin went to market to buy new clothes.
First he tested a pair of trousers. He didn't like the trousers and he gave back them to the shopkeeper.
Then he tried a robe which had same price as the trousers. Mullah Nasruddin was pleased with the robe and he left the shop.
Before he climbed on the donkey to ride home he stopped by the shopkeeper and the shop-assistant.
"You didn't pay for the robe," said the shopkeeper. "But I gave you the trousers instead of the robe, isn't it?" replied Mullah Nasruddin .
"Yes, but you didn't pay for the trousers, either!" said the shopkeeper. "But I didn't buy the trousers," replied Mullah Nasruddin.
"I am not so stupid to pay for something which I never bought."