I was lucky enough to be at the game where Peyton Manning broke the touchdown record. Sitting 12 rows back along the goal line he threw over. It was the most overwhelming experience of noise i've ever encountered.
On that same trip through the US I, after 13 years of being an Avalanche fan, watched a game at the Pepsi Center. I teared up as I approached the venue.
I also watched a Knicks home opener at MSG. Obviously the Knicks have been meh to bad for a long time but that was still a special moment.