A humorous story similar to Yang's son.

The following is a humorous story similar to Yang's son:

A man went to his friend, and his friend poured him a cup of tea. Then his friend's friend came, so he also poured a cup of tea for his friend's friend. Then, his friend's friend's friend came, and he also poured a cup of tea for his friend's friend's friend's friend. Finally, the friend of that person's friend's friend is not a good person. He picked up the teacup and threw it in the man's face.

This story tells us that sometimes our kindness is not always appreciated by others, so we must be vigilant when dealing with strangers to avoid unnecessary harm.