no offense to anyone else, but i have a hard time accepting those who are fans of, say, a school's basketball team but another school's football team. most such fans are just bandwagon jumpers. barring any reason such as the one bucknut offered (even though that reason leaves me suspicious), i don't see how such a fan could be a true fan of either school. sure, the person may be a fan of the team -- but not a fan of the school.
i also have a hard time accepting fans who aren't students or graduates of the team for which they root, weren't raised in or don't live in the area where the team is located, or haven't been a fan of the team for more than five or so years. most duke fans fail the first two of my qualifications, while the third qualification carries the least weight. the easier it is to be a fan of the team, the less likely i am to respect the fan. many would say that being a fan of ohio state football is too easy; our program is among the winningest. that is the case; however, i am also a huge fan of the basketball team, and no one can claim buckeye basketball superiority... yet.
we'll have our shot very, very soon.
edit: so, yes, bcsbust, i agree with you. any fan who is a trojan, dookie, patriot, and yankee needs to be shot.