Dr Enuf Suicide Bomber Bottle

While sitting around last night watching some internets with assorted guests we heard a loud pop come from the kitchen. When I went in to see what it was, there was Herbal Dr. Enuf all over the floor and shelves. Apparently one bottle decided to spontaneously explode.
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PICS:

A few notes:

• bottles have been on a shelf in my kitchen for slightly under 1 week
• bottles have not been exposed to direct sunlight
• temperature in kitchen has stayed around 82 plus or minus 5 degrees
• the soda that was in the broken bottle was not especially foamy, nor did it have any off smells that would indicate some sort of bacterial or yeast infection that could have led to fermentation
• I glad other people were around, otherwise I would have doubted it actually happened