Oct. 23, 2012 – Fans of the smash hit "Gangnam Style" staged a large-scale flash mob in front of Milan Cathedral, a world-famous tourist attraction in Milan, Italy, last last week.
A clip on YouTube shows over 20,000 people assembled at the huge Gothic cathedral as either participants or spectators. They are seen performing Psy's signature horse-riding dance in unison while singing along in Korean.
The next huge flash mob is expected in Rome at Piazza del Popolo on Nov. 10 at 4.30 in the afternoon. At least 5,000 person confirmed their attendance as participants through facebook.