This game has a lot of walls that you can push yourself through with mounting bugs and things like that. Getting on the other side of some of these walls (such as in Battlegrounds, for instance) can offer tactical advantages.
Patch 4.0.1 removed the auto-unstuck option. You can still get through the walls with a friend (using mounts, fear, poly, etc)... but here is a trick for the solo-exploiter. The TCG Fishing Chair can get you through a lot of these walls!
I made a video... check it out here: WoW - Exploiting with the Fishing Chair
((EDIT: I had posted that perhaps the Romantic Picnic Basket from the Love Is In The Air holiday would work the same way... but it was tested below and does NOT work. EDIT2: Someone else tested the Astral Tiger bouncy thingy, this does not work either.))
Happy exploiting!
~ The Wizard Trokair