Mulla went to town to buy new shoes. He tried on pair after pair, nitpicking every single one. After trying on ten different pairs and rejecting them all, he finally spotted a pair in the corner. He slipped them on. "These are perfect! How much?" The exhausted salesman said, "Those don't cost anything." "Are you mocking me?" Mulla asked. "No," the salesman said. "Those are the shoes you walked in wearing."