When my band was playing we used to mosh with each other on stage - so we had guitars flying about the place and all sorts - our most gruesome fuck up was when the guitarist broke a bit of the wood from the underside of his fret board on part of the drum kit, so the metal fret was sticking out underneath, me and him ran at each other during a solo and he sliced my arm, and i didnt even feel it untill i looked down and saw blood spattering everywhere.

The adreniline was amazing though.