A joke that happened in a drugstore.

One day, I went to the drugstore to buy medicine. A woman with messy hair walked into the drugstore and told her boss that she would regret buying medicine? The boss said that 5 yuan has 10 yuan, which one do you want in 20 yuan? The woman said: 20 yuan each. After the woman left, I curiously asked the boss if he had any regret medicine! Give me one! ? The boss looked at me and scolded me? One of your big men is pregnant, too.