And how did we not know about something this hilariously awesome?
We only clicked on it because it have 431 million views on YouTube. So naturally, we wondered what on earth it was. Turns out it's a video by a Korean rapper called Psy, and according to Wikipedia, is the most popular K-pop video. Maybe the question should be, what's K-pop? Korean pop, natch!
Not familiar with this gem? You'll want to be.