There is a quest in Blade's Edge Mountains called "The Smallest Creatures".
When you take control of a Marmont, you gain a buff that allows you to hide into the background. However, the Marmont is considered a pet, and thus you can dismiss it. The trick is that after you dismiss your Marmont, you still maintain the 5 minute invisibility buff.
For the duration, you are INVISIBLE and UNTARGETABLE. During this time, you can go on a pure ganking spree. Hostile players are completely unable to attack you. And NPCs will also ignore your attacks, even in towns and cities. The only way that the effect is broken is if you attack a NPC directly.
Enjoy your 5 minutes of bliss. If you can get a friend to get you in a BG as soon as you get the buff, you have unlimited possibilities! And yes, you can do this as many times as you want until they fix it of course.
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