FP, in the case of Brady Quinn's sister... that's acceptable (in my mind) because Ohio State and Notre Dame aren't rivals. Had Brady Quinn attended Michigan... then I'd say "tough titties, you gotta choose one or the other. Who means more to you, your brother or your future husband?" She's the exception to the rule, generally speaking, though. However, in a rivalry... there are no exceptions.
That aside, it may (again) be my way too serial passion for sports, but I just don't get the "I have two favorite teams" argument. I have one favorite team in every sport. There are other teams I enjoy watching, but in each sport it's one team far above every team below them. If I moved to NYC... I'd still be an Indians fan, but you bet your ass I'd take in some Mets games. Though no team will ever eclipse my childhood fandom. Which is why it's weird and unsettling for me to see so many people flaunting their false allegiances to teams they have no interest in. ESPECIALLY... when they claim to be a fan of a team while wearing another teams' hat. I manage to rep Cleveland pretty hard with what I consider to be some hella sweet swag. :D
Couldn't have said it better myself. Part of why I love seeing Cleveland hats and shirts when I'm on the road is that no matter how far I am from home... I know there's someone who I can have a casual conversation with. It's comforting.
EDIT: Oh... I forgot to comment on the necklace, FP! Thanks for the clarification! That's probably what it was, I never thought to check because in passing it ABSOLUTELY looked identical to the NY. That being said... if I were Lil' Wayne and I really was a die hard BoSox fan... you wouldn't catch me dead wearing that Young Money necklace simply because it LOOKS like the Yankees logo.