It's time to look back at the year that was on YouTube, and did you really expect it to be anything other than a "Gangam Style" video?

Psy burst on to the YouTube scene with his infectious hit, "Gangnam Style." It rocketed up to being the most viewed video ever on YouTube in mere months, so it only makes sense that YouTube's annual year in review would feature not only the song, but the singer himself.

The video is filled with all sorts of fun cameos by various YouTube stars from iJustine to the Annoying Orange. Queen of the Geeks Felicia Day even pops up in it.

After you've watched the polished video, enjoy the not-so-polished behind the scenes craziness below.