This sentence comes from the author: the old man in the flower.
Reasons for the rise:
The content and words of the jingle are popular and humorous, not limited to the flat rhythm. The required literary knowledge and meter are not high, which is convenient for ordinary people to pass on from mouth to mouth. At the same time, it is a form of social unrest, and it is people's criticism of reality, understanding of society and facing life. Five-element limerick is easy to create, easy to be accepted by the broad masses of the people and easy to remember. The limerick spread.