1) Block that kick hand motion. 4th down was always sooooooooo loud (think Miami 2001), and ever since the hand motion was added on 4th down.
2) North End Zone restriction ~ GT 2005. I still pinpoint this game as the first time I couldn't just walk into the North End Zone.

We've had quite a few huge games with amazing productions by the sports marketing department over the past few years, and although the stadium is electric, those key moments (and 4th downs), just don't quite get to where they use to. Admittedly, I watched the end of Miami 2011 from a DFAC in Afghanistan, so I don't have first hand knowledge of that game. Majority of the large/packed games since the earlier 2000's I have been present for.