A Flash Mob Stunt that I Enjoyed

100 Single Ladies stop traffic with Beyonce's famous leggy dance in Piccadilly Circus, to celebrate the announcement by Trident of its free Beyonce gig in November.

FYI:
A flash mob is a large group of people who assemble suddenly in a public place, perform an unusual action for a brief time, then quickly disperse. The term flash mob is generally applied only to gatherings organized via social media or viral emails, rather than those organized by public relations firms or for a publicity stunt.
-Wikipedia