By now, "Gangnam Style" has become part of the pop culture lexicon. The infectious song by South Korean singer Psy broke the Guinness world record for "most likes" on YouTube. The video has been watched nearly 425 million times and has inspired flash mobs and parodies by lifeguards, Ivy leaguers and hot moms. If you haven't heard of "Gangnam Style," you've probably spent the last month orbiting in outer space. Or perhaps you live above the 38th parallel, in North Korea.