Not at Jack Trice, so sorry if this shouldn't be shared, but ...
Was at Arrowhead for Chiefs-Vikings a few years back, and it was the year that UNI beat Iowa State and then we lost to Iowa State. After the game, I was in the Chiefs' team store place with my son (he was 8 or 9 at the time) and a friend of his, and my son had on a TigerHawk hat. We were in line to check out and here's the interaction ...
ISU fan, about 55 or so: "Hey! Get that hat off! That's the worst hat I've ever seen! It's a loser hat!"
It took me a second to realize he was talking to my son, but when I did, I stepped in front of my son and very close to this guy. I said, "What is your problem? If you are going to get in a 9-year-old's face about a hat he has on, we've got a problem that we're going to have to step outside to settle! Get some class and decide how you want this to go down! Right now!" I admit I was bluffing because, while I could have taken this old bastage easily, I didn't really want to get arrested for pummeling this idiot while I was the only adult with my son and a friend's son.
Meanwhile, a college-age kid was walking by and stopped, and he said to my son, "Don't take that hat off! That hat rocks, my man! That game was crap!" and gave my son a fist-bump. Turns out the kid was a student at to Iowa and really settled the situation.
The ISU fan says, "I don't care, it's a Cyclone state!" I responded with, "Well, isn't it a Panther state this year, or are you too senile to remember losing to UNI?" He just kind of threw his hands up and walked away. I followed him for a couple steps and said, "What, now you don't want to talk about this anymore? You only want to be a big tough-guy when you're talking to a 9-year-old? It's time for the adults to handle this now. Wait outside and we'll keep talking about it in a minute."
After we checked out, the guy was long gone.