I've got two. First was the 1988 game vs. the Jets where we clinched the AFC East title. I was 8, and had just started taking an interest in football, and my Dad took me to the game, my first. I had been rooting for the Jets that season (I was born in Manhattan and raised around the city) and my Dad was a lifelong Bills fan, he grew up in Cheektowaga. I remember being totally overwhelmed by just about everything at the stadium, and by halftime I was rooting for the Bills. Smerlas blocked a field goal to send the game to overtime, and after we won the fans rushed the field and tore down the goal posts. An awesome first game.
My second best memory was the playoff game in 1990 against the Raiders, winning 51-3. Again went to the game with my Dad, and the drive home is probably the happiest I ever remember us both being as a kid. I remember listening to the post game on the way home and finding out later that we were playing the Giants. We were so confident that we could not lose.