Because of course this has spread way beyond the YouTube community. Some Twitter users have even changed their profile photos to be the black and white swirly Annus/Unus icons.

You can even take a Buzzfeed quiz that tells you which Annus or Unus member are you (i.e. either Mark or Ethan). 

What exactly will happen when time is up? We'll just have to find out and see. If you'd rather just stick with what Hogwarts house you belong in, that's also totally OK, too.