This video was made in the Antwerp, Belgium Central Train Station on March 23, 2009, with no warning to the passengers passing through the station.
At 8:00 am a recording of Julie Andrews singing 'Do, Re, Mi' begins to play on the public address system. As the bemused passengers watch in amazement, some 200 dancers begin to appear from the crowd and station entrances.
They created this amazing stunt with just two rehearsals!
Enjoy! I hope it comes up - I have not had experience with "link" mechanism above - if not - google or yahoo it by all means!