It has occured on the streets of New York, London etc so it has to happen one day in Melbourne, and it did recently. Not quite random & spontaneous an event though as it was professionally choreographed & sanctioned by the City Lord Mayor.

Wouldn't it be great to see a "flash mob" with hundreds of rock & rollers dancing in the city square or Bourke Street Mall? I would be keen to join in if this could be properly organised. Wouldn't you too?

https://www.youtube.com/watch?v=xn4FczqpxG0