Now the whole thing isn't exactly creepy in the haunted mansion but parts are. Hands comes out of the walls and kidnap your party or these giant skeletons come out of mirrors and kidnap them while this ghost child laughs at you. Armor coming to life startled me even tho I suspected it. The thing I found most creepy was you find a book and read it to find how a woman went insane and sacrificed her family to a cult or something then herself. As you progress you hear this woman moaning. At first I thought it was the ghost of her. The rest of it is standard fair.
Oh and this is really an optional side quest no the HM bit is not really spoilers
[youtube]http://www.youtube.com/watch?v=z1aKdj8iWrs[/youtube]