Welcome to my Portal 2 walkthrough in 1080p HD! For best viewing quality, click the fullscreen button in the YouTube player, then select 1080p, or "original" for even better than 1080p.
Off we go into Wheatley's Test Chamber 12 (the didn't skip any this time). We are faced with a discouragement beam and 3 receptacles. I see a button leading to a pneumatic vent, which must be where we'll grab a discouragement redirection cube. I use portals to redirect the beams so I can drop on to a moving platform, then I reach the far end (evading a deadly laser grill) and press the button that releases the cube. Then, after farting around for 5 minutes, I realize that I must leave the cube on the moving platform (and the halt the platform) to direct the beam to the exit so we can exit. When we exit, we fall into a makeshift excursion funnel since Wheatley smashed up the exterior like a moron...
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