Simply put, any moment that you would have loved to have actually been there live at the arena/stadium for. The ones that really stick out for me:
I just linked a friend to The Rock's return, and man... I would have given someone's pinky finger to be there. Not mine, but still.
It would have meant the world to me to also have been at a) Extreme Rules 2011 to see Christian FINALY win the big one and b) the 2012 HOF ceremony to see Edge go in. That would have been incredibly rewarding.