Okay, manga times:
One Piece - Seriously Law, Ussop
did warn you, and dear lord Luffy, why do you insist on such dangerous things? As one youtube commenter put it, "I think it's a testament to the strength of the Strawhats that their Captain hasn't accidentally killed them yet."
...except for Going Merry.
Bleach - The Old Man when he unleashed his bankai was awe-inspiring in both senses of the phrase; scary as hell, but as amazing as hell...AT THE SAME TIME! Now, Unohana? *shivers*
~WARNING! MIND AT WORK!~
KH Wiki: The Keyhole
Fairly solid as a resource and rather organized, perfect for newcomers to KH.
Kingdom Hearts Wiki
Parent-site of The Keyhole, a little less organized in my opinion, but goes a little deeper into the mechanics of KH.