I have to say... this is the best glitch ever. And here is how it works:
1. Get a friend.
2. Both of you, take off all armor.
3. Buy http://cata.openwow.com/spell=96312 (Kalytha's Haunted Locket)
4. Make http://cata.openwow.com/item=58489 (Potion of Illusion)
5. The one that wants to transform, should make the friend use http://cata.openwow.com/spell=96312 (Kalytha's Haunted Locket)
6. Then, the one which will transform, should use the http://cata.openwow.com/item=58489 (Potion of Illusion)

After your friend uses the locket and then you use the potion, prepare for the laughs.

Here is a night elf tauren:

Goblin Night elf:

Undead night elf:

Night blood elf:

Troll elf:

Orc elf:



Post the alliance races combined! Would love to see that :)
Enjoy.