Google in the Czech Republic (that is Český Google) put up an Xmas special which enables the users to click on the faces of employees and in return they will sing for you in choir.
But don't think that you will click on the individual face and it will automatically sing for you! Of course it will, but you have to wait for a while, may be because singing is timed to be in sync!
Thanks To TomHTML for leaking this information 
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