Ok guys heres one of the funnest things to do in wow, and i hope you all use it for fun and NO ONE REPOST THIS!! i hate reposters, ill flame you and hopefully get you banned. find stuff like this on your own time.
(for pallys)
Step 1: be a pally 
Step 2: duel a mage
Step 3: (where it gets tricky) have the mage cast polymorph and right before its finished like (|||||| ) press bubble, and if done correctly you should be bubbled, but as a sheep.
Step 4: make sure the mage isnt a noob and casts it again, beacause that will make it go away. I forget the model term, but anything like getting stealthed, polyed, or deviate delight that changes your model character will reset the effect.
(for non-pallys) this one is a bit harder btw
Step 1: have a pally with you
Step 2: get an opposing faction mage to poly you (i.e. horde mage for allys)
Step 3: get this coordinated pally to bubble you before you are polyed (see above for details)
Step 4: make sure this mage doesnt poly you again and you dont stealth
Hope this brings you guys plenty of fun! Now theres a catch though, you dont APPEAR to be a sheep on your screen, but trust me youll know it worked when 15 ppl message you asking how you did that. You can mount and take damage, you just cant stealth or use deviate delights, orb of deception, ect.
Well there ya go one of my most well-kept secret between me and my friends

Screenshot:
EDIT!!!!: no no no!!! ok the sheep debuff GOES AWAY and so does the BoP, this was just taken while i was shielded for an example, you dont have any buffs on while its working