In my early teens, [my grandfather] would sometimes stomp around his living room, where he used to shave towards mid-day with bowl, brush and open razor, deriding my ignorance and mocking the made-up discipline of sociology, which I at one stage claimed to be studying. 'What is sociology?' he roared derisively, twisting and rolling the silly word on his Hampshire tongue. I knew, alas, that he was quite right.