A Rusian scientist from Moscow U (who has subsequently stayed with me for several days at at a time in the USA) took me on a tour of Prague and the Saturday after a symposium there. While coming back from main old downtown we were crossing Charles Bridge, when we were approached by two men who asked if we wanted to change money. I didn't know what was going on, so looked at my new found Russian friend. He also looked at me, and said "They mean you. They don't want rubles". A few minutes later we discovered that the potential money changers were being followed by two obvious plainclothes policement. Whether the first two were being watched, or tourists were being lured into entrapment we didn't know.

The excellent transportation system was explaind to me, and it was noted that the few kopecks charged for fares were just to keep schoolkids from getting on and riding on all sightseeing trips.