Okay, discovered this exploit while doing Loremaster and fooling around (And thanks to finding it, I don't want to continue the quest line)
First off, you have to get this quest in Azshara - Azsharite Experiment Number Two - Quest - World of Warcraft
It has a couple of pre-req quests, doesn't take longer than a minute or two though.
The quests, and the exploit itself is done here:
Once here, with the quest - Talk to Assistant Greely to get shrunken, then walk next to a rat.
Now either create a macro /cancelaura shrunkified, or just type the /cancelaura shrunkified in your chatbox.
Whichever you chose, now comes the hardest part (Which aint hard) - Click on the rat to mount it, and almost immediately after do the cancelaura command - if you did it right it should look like this.
Congratulations, you have your very own rat mount now!
You can ride it to anywhere in Kalimdor, but few words of warning.
-It will disappear on loading screens
-Any critter-killing companions will most likely annihilate your rat, so steer clear of Creepy Crates and Lil' Blizzard Store Pets.
Also, it's immune to fall damage, can be potentially useful for some lulz.
Proof:
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