“Gangnam Style,” the dance hit by South Korean rapper and former Boston University and Berklee College of Music student Psy, has become YouTube’s most watched video of all time. It had been seen 805 million times as of Saturday afternoon, according to YouTube, beating out Justin Bieber’s video for his song “Baby,” which has been seen 803 million times. (Bieber and Psy happen to share the same manager, Scooter Braun.) Worth mentioning is that the MIT parody of the “Gangnam Style” video, which was made by senior Eddie Ha and features Noam Chomsky, was up to about 4.4 million views by Sunday afternoon.