Username: 666

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Username: 666 (also known as sm666 on Nico Nico Douga.) is a video pasta by nana825763. It shows what happens when one searches for the username "666" on YouTube and then refresh the page a few times.

This pasta has actually created a few rumors, one of which is that the original "666" account contained a virus that changed all text into sixes.

Due to the popularity of the video, nana825763 created a "sequel" of sorts called Another YouTube

There is a similar video to Username 666 called "none" (lowercase) whose (now colored) footage appears the video the corrupted account near the end. 

thumb|right|300pxThis is an exploitable clone of nana825763's username 666. It's a clone, it works, but sometimes contains creepy viruses. If you are willing to take the risk of letting it into your system, that's fine. But it messes up computers. Just be careful, sometimes it affects other pages, too...

Nico Nico Douga also works with it, too.