I saw Mountain open for somebody way back when. Two songs into their set, some idiot in the crowd threw one of those giant 3 foot tall sparklers at the stage. It hit the guitarist right in the head and got stuck in that big pile of hair he had. A roadie ran out and snuffed out the fire with a towel but needless to say, that was it. The band walked off the stage. Another roadie grabbed the mic and said "someone should beat the #&@* out of the guy that threw that". That dude ended up getting a first class beat down.