That QPR - China olympic team was pretty big, i think. The worst I'v ever seen was Glentoran - Linfield (Quite possible the biggest non international match in Northern Ireland, this is not just a derby btw, this is a war between Catholic/Protestant(Glentoran) V Anti Catholic(Linfield)). The match ended 3-2 I think to the Glens, but the winning goal was scored by an ex-Linfield player. About 70 Linfield fans got onto the pitch and attacked about 4 or 5 glentoran fans and then the about 300 Glentoran fans got on and stabbed lots of people and the fighting went on for about 20 minutes!!