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On the morning of January 31, 2007, the Boston Police Department and the Boston Fire Department mistakenly identified battery-powered LED placards depicting the Mooninites, characters from the Adult Swim animated television series Aqua Teen Hunger Force, as improvised explosive devices (IEDs), leading to a massive panic.
People were still pretty 9/11 crazy in those days and I remember thinking the reaction was way more entertaining than even the marketing.
As a huge ATHF fan at the time, it just really spoke to me.