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We've already discussed the Aqua Teen Hungerforce guerilla marketing campaign that let to a partial shut-down of the city of Boston in January 2007 and the ING promo that triggered a similar scare and traffic chaos in Luxembourg city just a week later.
This latest example serves as just another reminder that you have to carefully implement guerilla marketing campaigns in this post-9/11 world - unless of course you want the bomb squad to come blow up your promotional materials.