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If all else fails..
If all else fails on the server, just blame the user.
Ecard website JibJab has attempted to use their 404 page as a way to reflect the humorous nature of their website, but frankly, it could be described as more creepy and less funny.
The blue screen of death
There's certainly no reason why a 404 page has to be boring, so why not give your users a heart-stopping moment if they happen to be fans of Microsoft's Windows operating system?