Eagles fans used to throw iceballs at the Dallas Cowboys. It was generally regarded as uncouth, until it was discovered some of those iceballs had D cell batteries in them. I think it was then regarded as felonious. I would imagine the NFL has a genetic memory of that and reacts accordingly.
Snowballs
Did anyone watch the Buffalo Bills-Miami Dolphins game last night? The Buffalo fans were pelting the Dolphins with snow/ice balls and it became so bad that they halted the game and asked the fans to desist. the thought of 300 pound, fully padded gladiators who hit each other in high speed collisions being scared of a few snowballs was hilarious.
What’s the Audio equivalent? Someone going ballistic when a fly lands on their $100K power amp?