Only the little ones got milk at our school, in little bottles with foil tops and a straw to poke through; but at the end of every day, rather than throw milk away, they'd bring it round the older classes in turn. By then, it was warm and a whole different thing to the icy stuff on your morning cereal. I can still recall the exact taste. Mind you, that was in the days before kids were allowed a drink in class, so we were all parched and tired by half three when it appeared. By then, the teachers had given up trying to make us work any more and it was story time or games outside.... blimey, hadn't thought about that for years!