I'll get it started. My fandom started in my freshman year of 1991, so I missed the famous 1990 SMU game.
Best: Watching UNT pound Baylor in front of a full house in 2003, 52-14. This game served notice to the local folks that we had a really good team, since we demolished one of the sainted-SWC teams. If only the momentum from this game would have lasted. This may have been Dickey's high point at UNT, along with the win over Cincinatti in the NO Bowl.
Worst: Watching UNT beat Nicholls State on a Saturday night in 1992 in front of a cool 500 people, including the band. It was a terrible opponnent in a terrible conference in a division of play that we had no business playing at for so long. I always thought that this game was proof of what poor leadership from the university and city had given to us. It was so empty that you could hear the Cajun accents of the coaches for Nicholls State without any problem.