I mean, what happens in between the time when you push the switch and when the microwave rings?
Maybe the rice pudding first turns into macaroni cheese in the darkness when nobody's looking and only then turns back into rice pudding. We think it's natural to get rice pudding, but to me that's just a presumption. I would be kind of relieved if, every once in a while, after you put rice pudding mix in the microwave and it rang and you opened the top, you got macaroni cheese.