Thank you for helping us by reporting bad content.
Here I show you examples of when we tried to access a website, and comes in a 404 error - page not found.
As you can see, many pages are trying to be creative to the point of customizing your website on the 404.
The last image represents the error in its original aspect.
You can see more examples in the source link.
Source link: http://azpadesign.com/criativas-paginas-de-erro-404/