We've all seen these, if not participated occasionally...and some of us have the scars to prove it.
My favorite one was a Day On The Green concert at Candlestick Park in San Fran years ago- Metallica was the headliner. The powers that be decided no alcohol, so they sold lemonade instead... and each plastic glass of lemonade had half a lemon in the bottom of the glass.
What could go wrong, right? 60,000 rock fans, pissed off at the no alcohol mandate, being armed with missiles?
It didn't take long for the first lemon to go streaking across the sky- followed quickly by another, and then it was out and out warfare. We were lucky we were in the stands and could use the seats as shelter... those poor bastards who were on the field never had a chance.
Somehow though I do wonder if the guy who decided to put missiles in the glasses got into politics...it had to be a Les Nesmin moment.