By unexpected I mean between countries that are not close to each other geographically or dont have other ties in recent history. I recall Netherlands and Czech Republic having sort of rivalry in early 2000s. They faced off in Euro 2000 and 2004 and plenty of qualifiers. The games were always great and competetive. I suppose games like Argentiina vs. Germany and Netherlands vs. Spain could also count. First one has plenty of football history behind it though. As for Finland, we have this weird rivalry with Hungary. They have traumatized the Finnish football fans on number of times ('97 being the most traumatic). Any other examples?