Kitten in "sandbox"
... if your web page is filled with nothing but cute and cuddly things that like to play together. But even cute and cuddly things have accidents...
Note: This is part of my presentation on Visual Security Policy for the Web.
The original photographer is unknown, but I got this from insertnamehere.99999 at www.flickr.com/photos/23258385@N04/2237739552/