I'll throw this in the discussion - We've been told that if they're part of the same act, one UNS foul is enough. For example, if 4 players do a dance in unison, you don't call 4 UNS fouls. You flag one guy and move on.... Others might have a different opinion, but that's how I understand it should be handled. Now if one guy does a back flip and another one is flipping off the opposing fans, that's two separate UNS acts so both should be flagged.
Mostly agree, but with the 4 dancing, I would penalize one foul but all four get their first UNS.