T-Mobile killed it with this guerrilla style campaign filmed at 11am on Thursday the 15th of January 2009 at Liverpool Street station, London. They cast some hundred people and had them dress in normal work attire while passing through the rail station. All of  a sudden a mix started over the loud speaker and these people got into formation and began performing their choreographed show. The whole station froze and many joined in. I’m sure the people in that station that day will be talking about this their whole lives. genius!