The notorious DrunkenBatman has found a pretty big bug in OS X. Granted, it won’t affect your everyday work (unless you somehow find these kinds of files), but basically, the image on the linked page will crash any app that uses the image processing API in OS X. Other apps that “roll their own” are not affected. The affected apps include, but aren’t limited to: Finder, Safari (and any app that uses WebKit), and iPhoto.
Here is the link to the article: http://www.drunkenblog.com/drunkenblog-archives/000760.html
Open it in Firefox if you want to read it. Do not open it in Safari. Be careful to not drag the image into your Finder desktop, or you’ll have some serious issues, as it will cause Finder to continually relaunch, over and over.