I'm so proud I've had nothing to say in this thread.
(I don't think I've posted, have I?)
I still have nothing to get all bent about vis a vis crowd stupidity, the motives of item-tossers, or the relationship of nationality, culture, and inappropriatude. You've all covered it!
I WILL mention that, I can picture a guy at a gig, just feet away from a performer. The performer's looking right at him sometimes (he thinks), and he can see him clear as day, and even thinks they're sharing a moment. Not necessarily he and the performer, but the performer and the crowd, particularly the crowd up front.
Something in the performance triggers the guy's notion to toss something up on stage...like we'd toss an apple or a tool or a beer across the room to a buddy.
Thing is, our buddies can see us, and we ARE all sharing the same experience. Guy on stage, though, is having a completely DIFferent moment than the guy in the audience, is bombarded by lots of stimuli the audience knows nothing of, and attending to all kinds of details. He can't pay attention to several hundred people who might helpfully toss him something.
Also - the lights are in his eyes. He is SEEN, but he can't SEE.
Guy tosses something, no intention to hit anyone, figures the guys on stage see it coming. They don't. Disaster.
Maybe not malignant or malicious stupidity, maybe just thoughtlessness.
(This doesn't apply to situations of obvious malice and assault, the spitters, the tossers of bottles of piss, the ashtray thrower, the fireworks idiots, or the gun-shooters. Those idiots are just idiots, and now we can go back to our outrage that they're part of the human race!)
(We also have people who will drop concrete blocks from freeway overpasses, trying to land them on - or put them through the windshields of - the speeding cars below. Sometimes, just to see what happens.
Extreme science, I guess. I'm pretty speechless about that.)