Mukthar, a bus-driver in Copenhagen gets an unexpected gift for his birthday: a whole flashmob just for him with songs and even a demonstration. The poor chap is so happy and suprised (his face at 2:06 is priceless) he even gets all teary-eyed. Awww.
(My Danish is a bit shaky but this website explains it all and yes, looks like it's a viral campaign. Notwithstanding, it's pretty awesome.)