I just came across this video via WoW Moviewatch (on WoW Insider). If you’ve been following things somewhat closely, you’ll know that the new Grimtotem Spirit Guide is extremely difficult to tame. This ghostly wolf is summoned in a Dustwallow Marsh event but only survives for 8 seconds. Since the Tame Pet skill takes 20 seconds to channel, this is obviously a problem!
With the right combination of buffs and gear ([Mystical Skyfire Diamond] to the rescue), you can lower that cast time below the necessary 8 second threshold. Mania has a nice write up on the ghost wolf, including taming information.