First one, in the instance Gundrak in the tomb of the ancients. Where second boss is if you do the snake guy first. In front of the boss is a pit area with a giant serpents tail. It is moving around so it is alive, I want to know who's tail is that?
Also in Icecrown in that pit of sorrows I think it is called, the saron mine near the Shadow Vault there is a lake at the bottom of the pit. At the very bottom of the pit is a C'thun looking beast. Is this the Old One Arthas killed when he was heading to the Frozen Throne to save the Lich King in Warcraft 3?