Yes it was when Stephanie mentioned that the Navajo's don't smile at you in the supermarket I started thinking of what would happen to you if you went around my local supermarkets smiling at people. Like you say they would think you where off your rocker or on something!

On the trains the only regular exception to late nights is when a train is delayed by more than about half an hour in the same place - that always gets people talking even if its moaning about the rail system to start with