The room went silent. Mr. Henderson didn't yell. He simply sat down, looked at the empty drawer, and then at the twenty-four faces before him. Without the book, the power dynamic shifted. The students realized that if Mr. Henderson couldn't grade their homework, they couldn't move on to the spring concert. No concert meant no trip to the city.
The legend among the students was that Mr. Henderson didn't actually know music theory—he just possessed the only "Key" in existence. Essentials of Music Theory: Teacher’s Answer Key
Mr. Henderson smiled, pulled a fresh piece of chalk from his pocket, and turned to the blackboard. "Then let's stop worrying about being right," he said, "and start listening." The room went silent