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Unsuspecting students walked into the Royal Institute of Technology in Stockholm, Sweden, one recent morning to find an interactive vending machine in the lobby.

As cameras rolled, students cautiously approached the glowing interactive vending machine and noticed a sign that read "Sing For Me" (in Swedish). In an effort to get people into the holiday spirit (and capture promotional footage) Coca Cola set up the Sing For Me interactive vending machine that gives out free sodas to people who sing karaoke for the machine.

The concept of an interactive vending machine is one that Coca Cola's employed in the past, but this machine is tailored specifically for the Christmas season. The machine is only programmed to include Christmas songs.