* There is nothing okay about the Boohemoth, the giant Boo in the ghost house in World 2 [[spoiler:and World Flower]]. It has a [[NightmareFace terrifying face]], being between it and a wall means [[OneHitKill instant death]], and it doesn't even play by Boo rules- if you stare directly at it, it will occasionally peek out from behind its ghost-hands and inch forward a bit.
** What really gets you is when you're just entering the hall it's in. It just appears out of nowhere with a high pitched laugh that almost gives you a heart attack. Huh. An empty hallwa- HOLY CRAP!
* The game introduces a Pirhana Plant equivalent of Dry Bones. Its appearance is [[http://static2.wikia.nocookie.net/__cb20120916113746/nintendo/en/images/6/6a/Bone_Piranha_Plant.png unsettling at best.]]