It's fun to talk about though, love these kind of discussions myself and remembering some of the players people bring in.
True, I made a topic on a different forum before for people to make an 'all time XI' (I'm a hypocrit), where you could only choose 1 player from a country and 1 player from their 'main' club. I.e. If you chose Puskas, you couldn't have Di Stefano (Real Madrid) or Kocsis (Hungary). Produced some interesting teams.