For me personally there are three that stick out.
1 - My first ever Canada goal Paul Peschisolido vs. Belize at Richardson in 2004. At the time I only casually followed Canada so it wasn't a huge deal then, but looking back on it that goal sort of sparked this obsession with the Canadian Men's national team.
2 - Serioux scoring against Honduras in Montreal. Biggest Canadian goal I've ever seen. For this blissful 45 minute period I was convinced we were going to South Africa. What followed is by far my low light following the national team.
3 - Revenge against Honduras a few weeks ago. Sure it was just a friendly and not enough to make up for two years pervious but now I can look back on a Canada-Honduras game at Saputo with fond memories. Great night.
Those are the best of the ones I've been at, but I also want to throw one just from watching TV out there.
2007 Gold Cup Quarterfinal vs. Guatemala, we were up 3-0 within the first half. That tic-tac-toe goal by Gerba is still the best I've seen Canada score and the performance in that half was the best I've ever seen from a Canadian team.