Eggs. According to the information about crabs that lay golden eggs in folk stories, crabs lay an egg every night. Story details: A mason got married and got two sons. He is ill and can't work any more. One day on the road, he found a small crab lying on a stone, so he grabbed it and put it in his pocket. This little crab can lay an egg every night, and the mason can get six gold coins during the day and soon become a rich man.