This thread isn't a classic, its actually only a few days old, but it has so many fine elements in it...
USA vs England - GameBattles Forums
You see the inevitable idiocy and ignorance, but these chaps have nearly distilled an art form from it... the usual stereotypes come up, you can see the celebration of the speedy death of the most intelligent American who pokes his head above the battlements, only to have it shot off by his own side, the moment the call for help goes out on European forums is clear, there ae demotivational posters and some pretty good humour, sometimes it even seems intentional. With a little bit of work we will remember the 4th of July as the day the war started rather than ended!