There is another post (from a few years ago) on here that asks about how to deal with tipping on chairs. Some of the respondents suggested that one way to deal with it is to remove the chair for a period of time. I strongly suggest that if anyone is considering this course of action, they check with their Senior Management first. I implemented this strategy in a class I was covering and I was told that I'd gone against the school's Code of Conduct by not treating the pupils with dignity. Consequently, I ended up facing a formal disciplinary hearing where I was given a First Written Warning. I don't want anyone else to go through the same thing. According to the CEO, simply giving warnings and telling the pupils about the dangers of swinging on chairs is enough to satisfy Health and Safety legislation. However, I am not too sure about that.