Either yourself or someone you observed?
I was at a Cards game and it was right after Julian Tavares came back after being suspended for pine tar. We were just a few rows from the third base line and he was put into the game. It was pretty quiet and I yelled, "Ump, check him for pine tar!! Pine tar!! He's got pine tar ump!" etc.
It got a pretty good LOL.
In college our fraternity would rent the party deck at a Legends game and just give the opposing right fielder hell all game.