What is the funniest thing the teacher of New Oriental English School said?

I told a lot of jokes in one class, so I can't remember them clearly. . This impression is the deepest. .

Dear aunt.

In Chinese, "Niang" and "Ma" both refer to mother. An English student who came to China for the first time to study Chinese took a fancy to a beautiful China girl on campus. So he wrote her a courtship letter, but for a moment he forgot how to write "Niang", so he cleverly changed "Niang-"to "Dear Aunt ..."