Tell me about the worst teacher you ever had in school.

My chemistry professor in engineering school did not try to teach. He assigned sections of the text book each week, but did not lecture on chemistry. He gave no tests. Chem lab was separate, and we got a separate grade for lab. Our grade for the class was our grade on a departmental final exam (90%) and our lab grade (10%). Fortunately, I had a great high school chemistry teacher, so I managed use what she taught me to get a B in the course. The professor was fired