Most of the best game I've attended have been mentioned but one which I don't think has was Motherwell 3-1 Celtic towards the end of the 2012/2013 season, and I think the win guaranteed us Europe(?).
We went 1-0 down from a Hooper goal from a rebound but after that we tore Celtic to shreds and the destruction on the counter attacked and dominance we showed all night was amazing. Goals from Ojamaa, a Higdon pen and an OG I think sealed the win, but Humphrey tormented Izzagueire (sp?) all night, Higdon bossed it up top and Ojamaa was on fire.
We could have honestly won that game 6/7-1 without a doubt! Great game.