I recall a math teacher I had in grade 9 - she was normally a phys. ed. teacher, who had been voluntold to teach math when the usual math teacher had a nervous breakdown and took a year off. She freely admitted that she had studied phys. ed. because she "loved to teach", and wanted her students to have a better time than she did, but she had struggled in English and Math, so she went for one of the easier specialties. Not exactly a shining role model there. All the other students loved her, of course, but I thought it would be better if she were a babysitter, not a teacher.