I was at a local race once and wondering who the Cat 5 was that was warming up in a Chevy/LA Sheriff's outfit (that day the Cat 5's raced after the P/1/2/3 which was my race). At the line it ended up being Jim Copeland, former US Pro Crit champion. He did look much leaner and tanner than a typical 5.
In NY there is a group ride in Westchester County. One day on that ride I noticed a rabid Rabobank fan - full kit, bike (Colnago), even the spinnergy wheels. When I realized he even had the gloves and booties I asked a friend if that was a pro. Ends up it was Marc Wauters (sp?). At the first of two sprints we all marked him as he was chasing things down. But he never jumped and we were all left there at 150 meters to go realizing all the early jumpers had won. People asked me (I was on his wheel) why I didn't jump. I pointed at him and said "I was waiting for him!". He laughed and explained that after a full World Cup schedule he was just taking it easy. Very nice guy.
I wasn't there but once Phil Anderson showed up at the same ride. The next day something like 200+ riders showed up hoping he'd ride again. Not to be. And in another ride (1994 I suppose) a group ride caught up to someone wearing the World Championship jersey. One rider, not pleased that someone other than the World Champion would be wearing the jersey, rode up to said individual and asked him "Who do you think you are, Lance Armstrong????". The rider turned to him. It was Lance. haha. He was a nice guy apparently and talked with ppl. The next ride was packed but no Lance sighting.