Since 9/11, high-profile events at venues that hold tens of thousands of spectators have been widely regarded as potential terrorist targets.

The Super Bowl, more than any other such event, seems most ripe for an attack. Given how many people attend -- and how many millions watch it on TV -- a terrorist would be hard-pressed to find a more inviting mark at which to strike. 

On a rainy Sunday afternoon in early February, the hundreds of law enforcement officials deployed throughout Dolphin Stadium in Miami during Super Bowl XLI were on the highest alert. It would be fair to conclude that on that day, the stadium was one of the most secure facilities in the nation. In addition to the massive police presence, bomb-sniffing dogs were working alongside high-tech tools like facial recognition software. 

Certainly no one could infiltrate these safeguards. But someone did -- six someones in fact. 

A group of men with fabricated media badges moved more than 2,000 "party packages" into the stadium. The packages contained light-up necklaces and instructions on how to use them. With virtually no hassling from security officials, the men distributed the packages to thousands of specially selected fans. Following the instructions they received, the recipients turned on their necklaces at halftime -- spelling out a secret message seen around the world. 

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Chad Vander Veen  | 

Chad Vander Veen is the former editor of FutureStructure.