Danny Newman was given a breathalyzer machine and put it to good use. He recently attended a festival in Texas selling mouthpieces for his machine for $5. Customers use the breathalyzer to find out their blood alcohol level, and Newman posts results on Twitter. The four-day festival is pedestrian-friendly, so those who buy the mouthpiece (and hold onto it) can check their BAC anytime they come across Newman. You can click here for Newman's website.