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Found on the appropriately named scythe.com, the webmaster lets you know that yes, it is all a conspiracy, people are out to get you, and the grim reaper will soon be paying a visit.
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.