My grade 10 religion teacher was awesome (I went to a catholic high school). He never taught a single lesson. He spent most of class telling us stories of all the random things he did in his past, chatting with the students, asking us for girlfriend advice, and we even played football in class a few times. The only time he taught us something was when he knew the principle would be nearby.
My grade 9 French teacher was also cool. Everyone loved her because she was super nice and a really good teacher. Most of us hated French but she made it really easy to understand. The guys loved her because she had huge boobs (I had to pretend to like them since I was still in the closet

).