Can you tell from the way I've written it what tone he said this in? Just in case you can't guess, here's a picture of the kind of facial expression we're talking about here.
I said to him, 'Er, let's just run through that again, shall we?' and made him repeat it after me, word by word, in a sombre, mournful tone, wearing this kind of facial expression instead.
Luckily, he played along. He was probably thinking, 'I know she's crazy already. I won't risk upsetting her.' I nearly gave him three merits and a chocolate bar for doing so, but I think that would have laid bare my deep need for approval and affirmation just a little too clearly. One so hates to look needy.
The longer I'm in teaching, the more I'm convinced that, apart from the really, really keen, of whom there are one or two in each class, the rest are there because they have to be. My job - and the job of most teachers - is just to make being in lessons as little like being excoriated daily with a cheese grater as possible.
You need go nowhere else for profound educational philosophies, see?