Similiar thing happened to me at Freo passenger terminal when I saw these campaigners. Climbed up about 15 metres and launched into the crowd. Knocked out a couple and got kicked out. Chewing my jaw bigtime!
I've only injured people at shows I've been playing. Leant on a fold back speaker a bit too boisterously and kicked it off the stage, taking a chunk out of a punter's shin. Another time I jumped out into the crowd and the headstock of my bass cracked some poor bugger in the head. He wore it as a badge of honour and proudly showed me the egg on the top his head after the set. I was apologising profusely and he was demanding I let him buy me a drink. People get weird at gigs.