I've been lucky to have experienced a lot of great games growing up going to Atlanta for the Peach bowl. I remember the street turning orange with Clemson fans as New Years dawned.
My favorite by far was the LSU game though. My husband and I were dating long distance at that point while he was in Afghanistan. I remember pacing in and out of my row on before the 4th and 16 play because I was on the verge of throwing up. I remember going nuts with everyone and my brother basically tackling me. Most of all I remember wishing my now husband was there and going back and forth via email with him for 15 minutes or so on the MARTA because he had lost the game streaming and had no clue what happened.
Looking back now it was also a HUGE (I would argue THE) turning point in our program in my opinion.