The Wizard is back with a new exploration, this time showing how to get into the instanced Cleft of Shadows using the new Darkmoon Tiger glitch in Ragefire Chasm. Unfortunately you can't just use the Tiger...you will also have to use some clever disconnecting to get around the instance portal or it will teleport you back to Orgrimmar. The timing is tricky, but it works! There is also a fun surprise at the end of the video showing how to access the very top of the Cleft of Shadows using a well-angled rocket boot jump.
This Tiger/DC technique should work on most instance portals with invisible walls behind them, such as getting to instanced Stormwind through the Deeprun Tram. The music is Steve Kotey's tape edit of the Chicken Lips 'Feast of Freeks'.