The evidence of societal collapse continues unabated.
This is a flash mob. It is coordinated by folks through social networking sites accessed through cell-phones, iPods and laptops. It is related to a "senior prank" but there is a huge difference between what used to be high-jinks and this sort of near-riot.
The Story Details
The real point to ponder here is that these are high school seniors. In a matter of days they will graduate and enter our society as supposedly mature, productive citizens. After 12+ years of public schooling they are very apparently neither.
Several conclusions can be drawn. The schools have failed to inculcate civility and values. The parents have failed to teach manners, respect and discipline. The society has nurtured an animalistic culture focussed on immediate gratification and sensationalism.
None of this bodes well.