A T-Mobile ad and Facebook caused a "flash mob" that literally shut down a London train station this past weekend.

What's a flash mob? The Urban Dictionary defines a flash mob as "an organized event where people gather to do a pre-determined action, in a pre-determined place at a pre-determined time. Usually harmless and funny." A flash mob can be anything from a pillow fight to a dance party and usually appears out of nowhere then ends in fifteen minutes or less.

In this particular case a 22-year old Facebook user simply identified as "Crazzy Eve" decided to get some friends together and mimic a T-Mobile advertisement that shows a flash mob in London's Liverpool Street Station.

In order to organize people he created a Facebook event and invited a few friends, who in turn invited a few friends; in the end close to 14,000 people had RSVP'd "Yes" to the event, and showed up to dance to music on their MP3 players at 7:00 PM.

Despite the mob causing the station to shut down for 15 minutes (simply because no one could move) no arrests were made, and another similar flash mob is planned for this Friday in Trafalgar Square in central London, and the following Friday again at the Liverpool Street Station.
 

Original Ad:

 

Actual Event: