A man with a balky mule had done all he could think of to budge that mule. The country doctor came along and said he had something that would start the mule. "Give it to him," the farmer said. "I'm worn out!" The doctor pulled out a long needle and gave the mule a shot. In a few minutes the mule perked up and dashed off at a mad run. The farmer watched the cloud of dust the mule left behind. "How much of that stuff did you give him? he asked. "Oh, about a dollar's worth," the doctor answered. "Well, Doc, give me three dollars worth, cause I've got to catch him".