I've been to better games, and I'm sure I'll go to more great games, but tops for me will always be my first: 2007 Georgia. Everything was so surreal and the way we whupped em made it even more special. I will never forget going to meet up with my brother in-law at the 1st-2nd quarter change and as dad and I walked down the ramp, I hear the stadium roar for the first time as the first play of the 2nd, Lucas Taylor lobbed it downfield to LaMarcus Coker who scored. That ended up being my dad's last game. That will always be my most memorable.
Other good games/memorable moments in Neyland I've been to:
2010 Oregon (or, more accurately, the rain delay and both sides chanting "F*** LANE KIFFIN!")
2011 Vandy
2013 Georgia (so close...)
2013 South Carolina
2013 Auburn (I may not remember that one correctly...or at all...)
Side note, CFA kickoff in Atlanta was REALLY fun as well, Music City Bowl...not so much......
Man, I feel young reading this thread...