This is hilarious. But before you read that first link, I suggest you read how it all works to gain an understanding. Yeah, the pictures are funny, but they won't be nearly as funny if you don't know the simple truth: They're dynamically generated.
So, armed with the knowledge that you could potentially create your own evil creations using nothing more than a specially crafted URL sent to Amazon's web services, have a look: http://www.gertler.com/nat/abusedimages.html
I like the creative abuse of their "Look inside" image.