404
The page you were looking for does not exist...
But lets make the best out of it!
Get Inspired: Creative 404 Error Pages
Web designers sometimes neglect their 404 error pages, despite of all the provided options. A generic and boring error message can make your visitor leave your site. While a good error message can make them stay a bit longer, and in some cases even find what they are looking for.
Here are some examples for really good error pages, that covers interesting ideas and approaches for creating attractive error pages.