I had a high school math teacher who sat in front of an overhead projector every class and bored the living hell out of every student, year after year. I had an English teacher who managed to take all of the fun out of literature. I had a Spanish teacher who used dry textbooks and called on students to answer grammar questions according to our seat order, strangling the life and breath out of a beautiful language.
You too, right? In high school we were exuberant in our youth but at times we slumped in our classroom chairs, minds drifting, bored beyond imagination by the droning voice of a lifeless teacher. It was like creativity, spontaneity and potential were being sucked from our brains, like slow death.
Always remember those times as you teach.