WOW: Silithid Immortal Pet Exploit. Tank Anything!

lord kri, princess yauj and vem hunter glitch immortal

With this your Hunter Pet will never die, the pet will become an immortal. You will be able to solo almost ALL of the game.
This requires you to be a Beastmaster Hunter. Go into AQ40. Tame Lord Kri, Vem or Princess Yauj. Congratulations: you now own an immortal silithid.
This pet will drop to 1 HP but no lower, no matter what it's hit with. ICC mobs, quest mobs, Gamon, it doesn't matter. It won't die. Not only will it not die, occasionally it will attempt to heal itself to full, forcing the mob it's fighting to whittle its HP back down.