82 Nebraska and 2005 OSU would top my list.
As an unmentioned underrated game:
1978 vs NC State.
A lot of interesting stuff there (good game against good team, some big game changing plays) and after the game PSU was ranked #1 for - IIRC - the very first time in school history. (Nebraska beat Oklahoma that same afternoon, elevating PSU to the #1 spot)
Those of a certain age remember in the pre-cell phone days:
When you were at the game - you were AT THE game. No outside distractions.
But the one thing you would get, during change of quarters breaks and what not - over the PA system (I can still hear this in the exact voice of the long-time PA guy. I bet other long-timers can too):
"In scores of other games....... "
And he would read off scores from around the country.
Late in the game, during a break, everyone heard "In scores of other games..." and he announced the Oklahoma-Nebraska score. That announcement get a very vocal response, and folks were certainly quite excited about it.
Meanwhile, on the field, PSU was locked in a could-go-either-way game w NC State (PSU may have been up by a FG or less), and just a moment after hearing the OU-UNL score, Matt Suhey busted loose on a punt return for a TD - and the crowd went bonkers (to a level I had never seen at Beaver Stadium - and wouldn't see again until the game vs Nebraska in 1982)