Join 'Extra' and Psy at The Grove for a ‘Gangnam Style’ Flash Mob! Psy will be stopping by The Grove on Monday, September 17 at 2 PM for a live interview with "Extra" to talk about the world domination of “Gangnam Style.” Also, all fans are invited to be part of a special “Gangnam Style” flash mob that will happen during the interview! We are asking all fans to participate in the flash mob to su