Joke: Why do you always laugh till your stomach hurts? Laughing is to make your girlfriend happy.

I told my son a joke. The English teacher asked a student, "What do you mean by hello?" The student thought how are you, so he answered, "How are you?" The son smiled and asked the teacher what to say. The teacher was angry and asked another classmate, "How old are you? What do you mean? " As soon as the son was happy, he rushed to say: This classmate must be talking about how it is you again! Ha ha ha ha ha! Right?