Geoff Cohen at Coherence Engine has seen the future of FlashMobs, and it's enterprise app meets viral marketing.

Flashmobs are critical elements of the connected enterprise strategy. Use them to mock competitors, sow confusion, distract the media from your most egregious foreign policy mistakes, or destroy the work of mad scientists who dare to play God. Don't let your competitors open up a flashmob gap. It's a first-mover's advantage, with increasing returns on the network effects, and only the most agile and connected enterprises will survive. "Keep the mob on your side."

This falls in the "Ha-Ha, Only Serious" category...