That's why the SN board is so important, where else could you post that and get a round of applause for your DS, and for you because you deserve it. Good logical thinking, and a two step conversation? Happy New Year and let's hope he doesn't move on to testing his theory of recycling food.
These little nuggets change your perception of the future. I know he'll probably flap and ignore us for the next 6 weeks before we'll get something like that again, but I know with him that since he has done it once he WILL do it again, and I'll have to face the stress of racking my brains for a way to induce it, but still it will come because it CAN.