Remember when flash mobs were the next big thing? Groups of people would tirelessly and secretly practice for hours upon hours and then turn up at a shopping centre or somewhere to perform a seemingly spontaneous dance routine out of nowhere? Well we're not too sure of the details just yet, but there was a| Remember when flash mobs were the next big thing? Groups of people would tirelessly and secretly practice for hours upon hours and then turn up at a shopping centre or somewhere to perform a seemingly spontaneous dance routine out of nowhere? Well we're not too sure of the details just yet, but there was a