Since the first flashmob of Improv Everywhere, many groups/organizations have done the same.
T-mobile with its dance in Liverpool Street Station and sang the song Hey Jude with thousands of people on Trafalgar Square in London. Also in Belgium VTM, the TV-station, copied the success story and danced around in the station of Antwerp for one of their shows.

Now H&M followed the trend and got 55 stylish kids surprise the public at Union Square in San Francisco with a hip hop dance battle that showcases the latest H&M Kids fashion.