I'll sticky this thread so that we can add examples of reactions to the "No school today then?" comment.
After my son left school, he used to pass the playground and swap Pokemon cards (they were big at the time) with the inmates. On one occasion I was chatting a few yards away when I heard a booming teachery voice demand "Why aren't you in school, boy?", to which D's incarcerated mate replied "He's too clever to go to school, miss."