Carl’s wife is sick and has a fever and headache. Carl goes to the clinic in the town to get his wife cold medicine. He walked into the clinic and saw an old doctor sitting inside. He walked up to the old doctor and said politely: Doctor my wife is sick and I want to get some medicine for her so that she can get better soon! The old doctor gave him a hard look, then stood up and slapped Carl on the face; Carl glanced at the old doctor knowingly. He thought maybe he was not polite, so Carl respectfully said: hello doctor , My wife is sick and I want to take some cold medicine for him. Could you please prescribe some medicine for my wife so that she will get better soon. Unexpectedly, the old doctor slapped Carl again. Carl was puzzled. He thought this was the medicine the old doctor prescribed to his wife? So Carl went home.
Carl returned home and asked his wife to do well, so Carl stepped forward to give his wife a slap. Carl’s wife was shocked by Carl’s actions, and sweated all his life: after a while, the wife’s fever went away without pain The wife’s illness is cured.
  But his wife hasn’t finished the medicine prescribed by the old doctor, so Carl should give it back to the old doctor after thinking about it? So, Carl went to the clinic in the town to find the old doctor and said: Doctor, my wife just took half of the medicine you prescribed. I want to return what my wife has not eaten, and thank you for the medicine for my wife.
  So, Karl heavily returned the remaining slap to the old doctor.