Was that with Jason Bangbala, Jubilee? I went on a course and he gave us similar ideas. He had some other really good ideas for behaviour management. He suggested to make a 'nice phonecall home', doesn't have to be a phonecall, could be a word with their parents when they get picked up, or a note to say how they've been well behaved or kind. It means more to the child than a negative message to parents.