It's been a little while since my last encounter, so I was little surprised to be trapped behind a psychic pedestrian today. You know what I mean, the type of person you're following along a street who walks very slowly but has the uncanny knack of moving in exactly the right direction at the right time to stop you from passing them. They were very common when I live in Hong Kong - in fact, they used to work in packs, swaying across the pavement in formation to prevent anyone from getting anywhere they wanted to go in a reasonable period of time.