Riddle: Vanessa is a bilingual student; she speaks English and German. However, she hasn't been preparing for her exams. She decides to complete all of her exams in German. When most of her teachers see her exams, they don't understand what she's written and give her the tests back. However, one of Vanessa's teachers figured out what she was doing and gave her an F-. Which teacher was that?
Answer: It was Vanessa's math teacher who failed her. Math is mostly numbers, so the girl's math teacher could understand everything and check the exam.