I started out as a fan of the Baltimore Colts, when they moved to Indianapolis I started following the Steelers. The Steel Curtain, Franco, Swann etc were cool to root for for a few years. Eventually I got bored with them and rooted for the Chargers for a few years. Became a Saints fan after that and they're still my favorite NFC team.
Became a Bills fan in the early 80's when I was in my mid 20's and have been a fan through good and mostly bad since.