Mrs. Bofini (also known as Mrs. Drone) was a past substitute teacher for Mr. Ratburn's class. The class disliked her, because she had a habit of chewing apples with her mouth open in front of the class, and talking while eating. During the flashback, she told Mr. Ratburn's students to spell the word leather, but her habits distracted them from spelling. She was ranked #2 of the worst substitute teachers behind Ms. Tremello, according to Arthur and his friends.