Havas Chicago's Noisemaker Only Works if You're Sloshed

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Havas Chicago came up with the clever device to help ensure that New Year's revelers are truly having a good time--a noisemaker that works only if you are drunk. If you're the handy type, that is, if you're not afraid to wield a soldering gun and you're comfortable working with Arduino tech, the agency provides instructions on how to make the Buzzed Buzzer here. The special horn provides an added bonus: if it works, you know you shouldn't drive home.