If ‘no’ this person is probably not a teacher. They are either a terrorist, a sicko who has crept into the school to flash their horribles at the students, a parent, or all of the above. All of these are trouble and are best avoided, but also avoid killing them out of hand because even though they are probably dangerous, possibly perverted and decidedly odd, they are definitely NOT zombies because zombies all, mysteriously, have ripped and soiled clothing. But then, so do most teachers. Especially maths teachers. Which makes identification of the teacher zombie a particularly difficult job (hence the need for this handy and rather reasonably priced little book).