College football has the best rivalries. Michigan and Ohio State, Texas and Oklahoma, Florida and Florida State, Oregon and Oregon State, Army and Navy, Cal and Stanford—I could go on and on.
The fact of the matter is that every major school has a major rival, and whoever wins the game that year gets to talk smack for the next 365 days.
Friends or even girlfriends that go to the rival school are not your friends for that week. The only reason you even allow them to visit you during rivalry week is to constantly berate them about how your team is going to destroy them on Saturday.
My personal experience with college football rivalries has been between Oregon and Oregon State. I'm a Duck through and through, and the Civil War game is always my favorite day of the year (not just game day, but my favorite day overall).
The last two years have been especially entertaining with so much riding on the line. If the Beavers beat the Ducks, then they were going to the Rose Bowl.
In 2008 the game was in Corvallis, and let me tell you, the people in Corvallis were very kind to us. When we went to the bar on Friday night, our beers were filled with pepper, and we received dirty looks from everyone. The funny thing is we weren't even wearing Duck gear; they just knew we didn't belong because we didn't have Beaver stuff on (apparently it's protocol to wear OSU stuff at all times there).
The following day on game day we were constantly cursed at and berated; even children were calling us names, and their parents encouraged it.
When the game finally started, the Ducks came out and throttled the Beavs 65-38. I didn't hear much from OSU fans after that.
The following year the two teams would meet in Autzen, and the winner of this game was going to the Rose Bowl. The game was everything that one would hope for. The game was constantly going back and forth, and the Ducks pulled it out 37-33, giving them their first Rose Bowl appearance since 1995. Everyone rushed the field and celebrated the monumental victory.
That day was everything that college football is supposed to be about. Sticking it to your rival team to go to a major bowl game—that's all you can ask for in your college career.