Another way to look at this very broad essay prompt is from the perspective of how things we say can sometimes commit us to action we may not be prepared to take.
For instance, if you were to complain about a given situation and/or the way the person in charge is handling it, the person in charge may well hand off the responsibility to you. If this were the case, you might find yourself thinking "me and my big mouth." An example on how to structure this essay might look like this:
Mrs. McGillicuddy, my English teacher, is not creative in her lesson planning; consequently, I am often bored in her class. Every day, we read a story or poem and she asks us questions about the work's theme and the techniques the author uses. Like I said, boring. One day, Mrs. McGillicuddy heard me complaining about how predictable and unexciting her class is. She smiled sweetly and said that it would be my responsibility to plan lessons for the class for the next week. My big mouth and I had to think of a way to make poems and short stories more exciting for my classmates and me.
To compose the rest of your essay, plan a topic sentence for each of the subsequent paragraphs. You might organize the paragraphs chronologically as you approached the task of planning lessons. For example:
paragraph 2: how you learned the material well enough to teach it to others
paragraph 3: how you designed your exciting lessons that kept all of your students engaged
paragraph 4: how you assessed your students' learning
paragraph 5: what you learned about teaching—and "you and your big mouth"
The takeaway here is the importance of planning your essay's structure before you begin to write, no matter your topic. Once you have decided on your thesis and written your introduction, plan each paragraph's topic sentence, including your conclusion.