Mine is pretty obvious. Another reason was it was the first chant I ever remember hearing. When I was really young, my folks to me to my first NFL game, and it was a Pre-Season game between the Bills and Chiefs at Arrowhead Stadium. We were from Kansas, and only a few hours from KC, so we decided to go see our favorite team, the Bills play. When we got there, we headed up and up to our seats in the nose bleed section....and there we saw another group of Bills fans, and I was relieved. When they saw us, the first thing out of their mouths was "Let's Go Buffalo"......and so there it is.