Short Answer: Because they wanted to "shade" their amazing teaching skills! 😎
Explanation: The teacher had to wear sunglasses because their teaching prowess was just too bright for the students to handle! 🌞 They wanted to protect their students from being blinded by their immense knowledge and captivating lessons. Plus, who wouldn't want to look super cool while imparting knowledge? The sunglasses are a fun way for the teacher to show off their incredible teaching style and keep the class engaged with their awesomeness! 🕶️