Hello!
If you want to get behind locked gates like the Shattered halls one when no1 got key and you don't have a rogue, do this.
Find a horde close to the gate(if you're alliance), it nearly always is one. Spit/attack him and run to the gate. Let him kill you and go back and ress behind the gate. Not very useful but I'm sure you could use it...
You could do this with mobs but then you will get a repair bill
thanks