Where is the friends Home? (Khane-ye doust kodjast?) (1987) Dir. Abbas Kiarostami
This is a wonderfully sweet little film. It is about a boy who by mistake, takes his friends homework book home from school and spends the rest of the day trying to return it to him. That is it, and it is all that is needed for Kiarostami to show everything important and everything anxious that children feel. Someone has been kind enough to upload the entire film with English subtitles on youtube so you have no excuse not to watch it. It is in the top 10 of the BFI top 50 films to see before you are 14 and has the best performance by a child on screen, ever.