A guy paid Mulla twenty coins to be his witness in court and testify that another man owed him a hundred bushels of wheat. When it was Mulla's turn on the stand, he confidently said, "I testify that the defendant owes this man one hundred bushels of barley." The judge frowned. "He is suing for wheat, why are you testifying about barley?" Mulla whispered, "Look, he just paid me to testify. We never negotiated the specific grain types."