At a Dead show I worked at in 1970 they had cherry bombs wired to one of the kick drums so that they'd go off on certain beats. In a small theater full of tripped-out funseekers it was pretty persuasive. But aside from ear damage, it didn't create any kind of hazard for the band members. And that was a long time ago. I haven't seen it since. So, thanks for the update. Sounds like I haven't missed much!