A Coca-Cola vending machine is spreading Christmas cheer in Sweden one bottle at a time. Equipped with two microphones and a karaoke screen with lyrics, the "Sing for Me" machine at KTH - the Royal Institute of Technology in Stockholm - is accepting carols as payment for soda. The carols are produced by Karaokefabriken.
This isn't the first time a Coca-Cola machine has accepted something other than money. Last spring, a machine in Singapore gave free sodas to customers who gave it a hug.