The 404s website is an ode to the not found web pages.

The 404s is an ode to the not found web pages. The name of the site refers to the standard response code of the HTTP protocol for pages not found. This site celebrates the error — and I believe that celebrating our mistakes to the point of taking pride in them is somewhat healthy.
I also think that the 404 page of this Manual could use a little attention, don’t you think?