I’ve subbed quite a bit over the past five years. I think “what gives” with these kids is that they are dealing with heavy crap outside of the classroom and taking it out on you. I am confident that the students would behave the same way with any other sub, or even with their own teachers. Despite whatever they are dealing with at home, it’s not fair for them to take it out on you. But it’s so difficult to deal with since you are only there for one day. Are all of the schools in the district you work in filled with kids like this?