re: Best play in your teams history .... That was negated by a penalty?

To me, bigger would be penalty that directly cost LSU a big win. September 1979 - Unranked LSU leads #1 ranked USC 12-10 with 4 minutes left and USC faces 3rd and 9 on their own 36 yard line. LSU sacks the USC QB to bring up 4th and long and punting situation for #1 Trojans. But Tigers called for facemask on the play giving USC a fresh set of downs after which All American Charles White leads a time consuming TD drive giving the Trojans a 17-12 victory to remain undefeated and #1.

For me, That penalty will also be the biggest play for LSU football ever negated by penalty.