Here's a clip of a gaggle of ladies performing Beyoncé Fosse-esque routine to "Single Ladies (Put A Ring On It)" in London's Piccadily Circus. Pretty nifty, right?

Also, the Flash Mob zaniness doubles as an ad for Trident Gum. Pretty sneaky, right? (See, no one is immune to the power of advertising. Even you, trustifarians. )

Enjoy.