"Mr. Keptor, the old math master, was very annoyed with me for a long time because I chatter so much" (6).
In the above passage from Anne Frank: The Diary of a Young Girl, Anne reveals that her math teacher is Mr. Keptor. Not only that, but Anne knows well that her constant talking during class annoys him. In an effort to quiet her, Mr. Keptor assigns Anne to write three pages of a composition entitled "Chatterbox." Anne quiets down for the moment and writes the assignment in her notebook. Later that night, Anne decides to argue in her paper for Mr. Keptor that she will try to do better in the future, but that since she is female and her mother's daughter, there is no cure.
Mr. Keptor accepts her essay, but Anne still can't keep her mouth shut in class. As a result, she is assigned another paper to write. This next paper is called "The Incurable Chatterbox." However, Anne is still talking during class a few days after this second submission. Therefore, Mr. Keptor assigns a third composition to be entitled "Quack, quack, quack, says Mrs. Natterbeak" (7).
Anne is humiliated by the title of the third composition because the students all laugh when it is announced. She decides to write a playful poem about a father duck who bites his babies to death when they chatter too much. Mr. Keptor's response to the third assignment is as follows:
"Luckily Keptor saw the joke, he read the poem out loud to the class, with comments, and to various other classes. Since then I am allowed to talk, never get extra work, in fact Keptor always jokes about it" (7).
It seems as though Anne wins over her teacher with her unique personality. Mr. Keptor attempts to squash Anne's chattering three times, but to no avail. In the end, Anne is accepted for being a chatterbox, and Mr. Keptor leaves her alone.