http://www.joystiq.com/2010/09/10/haunted-majoras-mask-cartridge-detailed-on-video
Here are the actual Youtube links in order and also the last link that Joystiq forgot to add
Make sure you watch it in this order
Make sure you read the video descriptions on BEN.WMV and DROWNED.WMV in particular
Even if this is (and it probably is) fake its a damn good one.
But hey if this is real...