I had no idea i was about to be called on to share in a revelation. I just assumed his group was one chair short. Of course, i started to twig when, instead of picking up the seat and moving away without incident, he sat down next to me. I concentrated on keeping my balance. 'Son', he explained at once urgently and patiently 'you buy land, you get stones. You buy beef, you get bones.' the counsellor in me would have nodded and let him continue. The person out on a night out with his friends would have..