I am a huge Bronco fan married to a huge Bears fan living in Chicago. Interestingly, I am still a fan of the QB-that-spurned-us, and after years of being a supportive hubby, I kind of root for the Bears now too.
I grew up in Ohio as one of those anti-home-team kids, so I despised the Bungles, Browns, and Buckeyes. I grew to be a Bronco fan after seeing Elway and the Broncos almost routinely year-in and year-out beat either the Bungles or Browns in the regular season or postseason. And the rest as they say is history...
PS: A long time ago, I unofficially donned the mantel of the RCA, or the Resident Cutler Apologist, and I am still wearing it to this day with shame, er... I mean, pride!!!!