My daughter is doing violin lessons at school, she has bit of an eccentric teacher who gives them all a single smartie/ M&M/ Hula Hoop at the end of the lesson if they bought their violin with them. I've always found it amusing because he tells the parents (they like the parents to go to lessons so that they can help with homework, I'm getting quite good at Twinkle 
) how it rewards them for remembering to bring it and practising... however, one little boy who never has an adult with him hasn't had his for a couple of weeks. The conversation between him and the teacher will have gone over kids heads but is obvious to me. He says he has left it at home, teacher says he knows, HT explained to him, boy says it's not his fault, he doesn't know when he can go home, teacher again says he knows but he doesn't have it with him. A couple of turns happen on this conversation.
I feel so sad for this little boy, the teacher makes such a point about how this single smartie rewards them and when a child is showing enthusiasm for this single smartie but for reasons out of his control he can't get it, it seems so unfair! I once forgot to bring my daughter's violin, she stayed over with my parents and I didn't think to send it and thought it was OK because I was going but went to the lesson and because I wasn't used to taking it, I left it behind so I bought her sweets myself as it was my fault.
I was talking to Mum about it yesterday, she agrees with me and would take some sweets in to give him after the lesson, I'd feel bad doing it in front of the teacher and was thinking of getting my daughter to give them to him so it's a bit more discreet and she won't know what I know, just that I thought it wasn't fair when it wasn't his fault and I'd given her some when it wasn't hers.