http://www.youtube.com/watch?v=0GcLW0g_c1s

Choose "Cross-Eyed" in the drop down menu (just below the video) and bring it up to fullscreen. Then all you gotta do is cross your eyes until both the left and right video meet just in the middle. At first the video seems blurred, but just practice a bit and you'll see it in 3D!!! It works!