I grew up an hour or so outside of Los Angeles and there were no sports fans in my family (unless you count NASCAR ... and I don't). I was really into baseball and grew up an Angels fan because back then they were the California Angels and, being somewhat of a literalist at age 6/7, figured rooting for the Dodgers would be weird because I didn't live in Los Angeles. Because I didn't identify with the LA teams, I had no real football team that made sense based on geography and leading up to the San Fran vs. Miami super bowl (which, because of the lack of sports fans was the first real football game that entered my consciousness through friends) everyone was rooting for San Fran and I tend to root for the underdogs, so me and like 2 other people in my school rooted for the Dolphins. They didn't win but I had publicly professed my loyalty and could not go back. Sometime after that I recall seeing a documentary on TV about the '72 Dolphins undefeated season and that just further cemented what a good choice in NFL teams I had made.