The first time I watched this I was blown away by incredible bike handling. Then I found out it was a video game, so I watched it again. It's hard to tell whether it's real or memorex. The wheely going through ess turn was a bit much, the bike is a little too clean, and the background is a little plain. But dang, it's still hard to tell.
Update June 2015: The original video got pulled, so I looked around and finally found this one. Not quite the same thing, but very similar.