Five thousand dollars and three eggs. What kind of joke is this?

There is a newly married couple. One night in the bridal chamber, the bride took out a wooden box and said to the groom, honey, promise me not to open this box in my life. The groom agreed. Five years later, one day, five years ago, when the groom was cleaning, he saw the wooden box five years ago. Not seeing it is a state of mind. He felt sorry for his wife after reading it, hesitated for a long time, and decided to open it. There are three eggs and 5000 yuan in it. At this time, the bride came in five years ago, and they were very embarrassed. The man said: Wife, I'm sorry. I didn't do what I promised you. I still opened the box, just 5000 yuan and 3 eggs. The woman pondered for a long time and said, I'd better tell you. Once I had an affair and put an egg in the box. The man thinks it is understandable to have an affair three times in five years because he loves her very much, and then says, what about this 5000 yuan?

His wife said, I saved enough eggs to sell, saved enough eggs to sell, and finally saved 5 thousand yuan.