Hi In one of my classes over the past week there has a been a spate of pupils throwing pieces of rubber across the room/ onto the floor - they do it when obviously I am not looking and can't see who's doing it. The pupils are 12/13 but it's not a common thing in my school. I am feeling weakened by this and it's affecting my confidence - there are a few challenging kids in the class though. Should I tell my HOD to talk to them or try to deal with it myself? Any advice appreciated. I feel rubbish that the kids think they can do this in my class. I taught some of them last year and this never happened. Behaviour in general is not the best at times in my school. Thanks.