You MUST watch this until the end. Whole thing.
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!