Say you’re out and about in your powerchair, trundling peacefully along. You have decided it’s time to head home, so you’re heading towards the entrance to a DLR station. All of a sudden, however, you go down a step which you didn’t see: it isn’t very big, nothing is damaged, but the jolt is enough to bring you to a halt, wondering why the blazes you didn’t see the drop coming. Then, some random woman who apparently saw the incident chimes up with the words “Careful, there’s a step!” She delivers these words so dryly and with such a lack of irony that surely the only possible response you or anyone else could give is “No shit!”