At my primary school, one of the Japanese teachers got "bashed" by a year 6 kid. The teacher was a permanent teacher, but he was really soft and against violence, so all he did was saying stuff to calm the kid down, while recieving blow for blow in kicks and punches. 
No offence meant to the following post to teachers that find their job relaxing while also teaching competently. There are always exceptions to such cases, but I know a teacher who was new to my school. He taught me two subjects and did jack all teaching. In classtimes, the most productive lessons were made through "discussions" with the class about the topic, while he stood and watched, occasionally pointing to raised hands to indicate that it was their turn to give their opinion. However, frequent were the discussions off topic, and the initial debate on "Was such and such motive justified?" quickly turned into one about tattoos and how gangsta looking it was. After such fruitless "teaching", the teacher would assign as projects where he did not give us any guidance or headway in, and ask us to research it, then write up what you've researched. After a week of searching for the most minute details of stuff on the web, we'll hand in the project, and it would literally disappear in the hands of the teacher. After nearly 6 months, a score would appear on your report (just a graded score), but the project itself was still lost forever. Coming to think about it, if you need not do any class preparation, or have all the time you want to correct homework, without any set standards in terms of feedback, a teacher's job would be soooo easy! Again, there are exceptions, but this is just one example I know of.