Earlier this month we shared a story about Molson Brewery‘s free beer vending machine promotion in Europe. Well now the Dutch coffee company Douwe Egberts is getting on the free bandwagon with a campaign that places free coffee dispensing machines in airports, with a slight catch. The coffee machines are equipped with facial recognition software and only dispense a cup when the machine detects a yawn from the user. The “Bye Bye Red Eye” vendors have already been a big hit with travelers passing through Johannesburg‘s Tambo International Airport. Where will they show up next?