Mine is kind of a stranger one.
I was born in Lexington, KY but moved to Richmond, VA before I even turned one. I lived there for 8 years then moved to Rochester, NY. My next door neighbors in Rochester became my best friends growing up. I spent a lot of time over at their house because their parents were very lenient, and were almost never around, so we got away with most anything.
My dad used to watch football, but he was never really very partial to any team, just enjoyed the game for what it was. If anything, he was a Bears fan, because he grew up in Gary, IN. He was really only passionate about one thing sports-wise, and that was the Michigan Wolverines football team, his alma mater. So, I grew up loving the Wolverines.
My neighbors, who were big Wisconsin fans because their dad played Badger football, also liked the Wolverines and I would alternate watching Michigan games at my house with my dad and at their house. Being Wisconsin fans, they were also HUGE Packer fans. Every Sunday I can remember, we used to find ways to watch the Packer games from their basement. I would steal the one cheese hat they had and wear it while cheering on the green and gold. This all was during the Favre tenure in GB, and I loved watching the guy play. I can thank him for my love of the Packers. I have many memories of going over there in my Favre jersey, watching the game with the cheese on my head, and tossing the football around during any downtime, pretending I was the big #4 himself.
Anyways, kind of a confusing story, and I still don't fully understand why I'm a GB fan and not a CHI fan (probably the team's colors, haha), but I am, and that's all that matters.