Wow, what a good question. My first inclination would be Game 6 of the 1993 World Series, but I was in town for that game and joined the mob on Yonge Street afterward, so I'll pass on that one. Game 7 of Lakers/Blazers is another interesting choice, as is Game 3 of the 1987 Canada Cup.
I'd have to go with Super Bowl XXXII, narrowly edging out the 1986 Masters and the 2002 Olympic men's hockey gold medal game.