2012 MTSU was probably the worst atmosphere of any Tech home game I've attended. Just pure misery. The business of smoking in the stadium that day was not even optional, it was either light up or kill myself.
2003 Clemson and the Purple Shirt Massacre was basically the antithesis of the Auburn game a couple of weeks before. The only, and I mean the only, enjoyable thing about that game was PJ Daniels hurdling a dude. The rest was just embarrassing, especially after we had mostly played well despite starting 1-2, and Reggie vowed we wouldn't lose again after Chris ööööing Rix broke our hearts.
2008 Gardner Webb doesn't need much explanation, but it's easier to brush it aside knowing we were down to our practice squad QB.
2009 Orange Bowl was just a horrid, awful trip to watch us get slaughtered. The only saving grace was that I was able to watch us play in the Orange Bowl which was special regardless of the outcome.
2012 Georgia, I don't even want to get into.
As far as heartbreak goes (without getting into the obvious Georgia games) the 2001 Maryland game was devastating, even worse to me than Clemson that year. The 2012 Miami game left me feeling hollow, less than alive. Leaving that game seeing the looks of Tech fans who had just watched their souls be raped and murdered was only made worse by the fact that the traffic leaving is still the worst I've ever dealt with for a Tech game.
And of course the 2006 ACCCG. Just typing out that sentence made me legitimately angry and now I'm pissed off that we're even talking about this. Typing the final score to that "game" should be an automatic ban on this forum and I'm not kidding.