Well, I was looking at my forum name, and saw I was marked as a lazy leecher, and thought I would try to get rid of it, I did some searches, but didn't find this anywhere, maybe I'm blind, but this is pretty great!
This can only be done as Horde, for it's a quest at Venomspite in Dragonblight, sorry, Alliance.
The item is called Siegesmith Bombs, it's given when you start the quest "Bombard the Ballistae" thottbot.com/q12232 the after quest from "Stealing from the Siegesmiths" thottbot.com/q12230
These puppies can break Rogue/Druid stealth, Mage's Invisibility, although, it CANNOT be used in Arena, it can be used in Battlegrounds, and is not effected by LOS.
The bomb has no duration, or charges, and can be kept as long as you have the Quest, it also has a stylish effect, that makes most critters attack (yay! free rage!)
I just used this to pull King Dred in DTK through the wall, to get the achievement. If this helped you, don't forget to Rep, I need out of Leecher