There is an old joke about a new arrival in Hell, who is given the choice by Satan of two different working environments. In the first, frazzled workers shovel huge piles of coal into a fiery furnace. In the second, a group of workers stand,waist-deep in sewage, sipping cups of tea. The condemnedman opts, on balance, for the second room. As soon as the door closes, the foreman shouts “Right lads, tea break over. Time to stand on your heads again.”