Thousands of people who responded to a text message alert gathered in London's Trafalgar Square to sing in a mass karaoke publicity stunt. The event was part of a T-Mobile commercial. The crowd was in for a surprise when they discovered that pop star Pink was leading them through the chorus. The singer emerged out of the crowd, delighting her fans. Pink says she loves karaoke and has a karaoke machine at her house. Take a look:
