Hundreds of People Stop and Dance - T-Mobile Viral Ad: Liverpool Street Station, London

In a brilliant marketing move, T-Mobile created this viral ad of hundreds of people randomly dancing at Liverpool Street station in London which took place Thursday 15th January 2009. Although this is a HUGE bite-off of Improv Everywhere's frozen people at Grand Central Station in New York, it's still a highly effective ad, and I give them credit for that.