Wingnut, that reminds me of a story.....
Back in the eighties we had a string of shootings on area freeways (Detroit, no surprise).  Snipers were setting up on the overpasses and taking potshots at motorists.  I was driving home from work one day when BANG! someone took a shot at my truck.  As I sped off in fear, they shot at me again BANG!.  
Turned out to be the six pack of PEPSI in the back seat that I had bought that morning.  It was a real hot day and those cans were popp'n like bombs.  For a minute there I thought I was the latest sniper victim. /w3tcompact/icons/mad.gif  When the cans 'popped' they did not rupture.  The aluminum just expanded in one quick instant to a distorted shape.   They made one heck of a sound /w3tcompact/icons/crazy.gif