I always seem to be the last one on the bandwagon. So HERE WE ARE: Gangnam Style, the most popular video on YouTube that I've actually watched. (I did check.)
WARNING: On the off chance you haven't watched this... this video is weird. But not in a bad way, more in a mesmeric, magnetic way.
I have a new policy: I'm not going to watch YouTube videos that are more popular than Gangnam Style. Of course, that restricts me from watching only eight videos at the moment, none of which I'd ever be interested in anyway...