The most exciting race that I attended was the 2010 BC Classic. Really the entire day was great, including being blown away by Uncle Mo's performance in the juvey and finally seeing in person one of my all time faves Gio Ponti, who unfortunately fell short in the mile to Goldikova but I was glad to see her in the flesh, too.
The Classic had been so hyped and the crowd was electric. As the race unfolded we thought that Zenyatta was toast, but her rally and the accompanying roar from the stands was awe inspiring, followed by a mass deflation as Blame held on. That oscillation in the crowd, from low to high to low again, was a sensation that I'll never forget. My own low was eased as I realized that, thanks to my doubling up on the trifecta box that an old friend had given me to bet for him, I had a nice ticket to cash. Thanks, John.
The 2010 Breeders' Cup Classic
http://www.youtube.com/watch?v=_Et15M6wsPo