Bad Teacher has made 2011 a memorable year for crazy members of the educational system, but the titular character is really more of a poor influence than an actual villain. Some movie teachers, though, would scare even the toughest of grown-ups: they are often terrifying authority figures, and indeed many of the most psychotic villains ever to crawl out of a screen and into our imaginations can be found in front of a blackboard. If you thought your lessons were bad, you should check out these psychotic professors…