North Texas, 1989. I had attended every home game for the previous 2 years, so this really was better than anything else that you could imagine. Beating NU in 1998 probably was more satisfying, but I wasn't there in person.
Strangest thing ever (and actually semi-positive at the time) was the 17-17 tie in the toilet bowl with ku. The Fence and all the guards & police that were brought in to prevent riots in Aggieville made it look like "Escape from New York". The slack jawed, disappointed, and puzzled looks on the crowd that staggered around Aggieville that day (Cat fans, ku fans, would-be-rioters) captured the depths to which the 2 programs had sunk. It is almost incomprehensible unless you were there.