Nice stunt in Brazil by Ogilvy. They made the “Karaoke Breathalyzer” and used it in Bar Aurora & Boteco Ferraz.
To increase awareness about drunk driving, they created the world’s first microphone breathalyzer and invited people to sing karaoke. Once up on stage, with their guard down, they took them by surprise. At the end of each song their alcohol blood level was shown, not the karaoke score.