Whichever UNI game where it was hot as balls, and then ISU lost as well - think that was 2013. That was the worst. Went with some friends (including one UNI grad) and it was miserable physically and emotionally. We alternated a beer, and a bottle of water tailgating all day. We didn't die, anyway.
We were going to go out and paint the town, but we got back to the hotel and everyone was already shot from the heat, so we just turned in.
Double checked - this was 2013. And it WAS the same season as the Kansas frostbite game.