U.N. Secretary-General Ban Ki-moon, left, is taught how to dance Gangnam Style by Korean rapper PSY at the U.N. headquarters in New York on Oct. 23, 2012. The U.N. chief joked during their meeting that he felt overshadowed by PSY, whose video has scored over half a billion views on YouTube. "I'm a bit jealous. Until two days ago someone told me I am the most famous Korean in the world. Now I have to relinquish. I have no regrets," Ban said.