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Found on Tumblr, this odd 404 page for mspaintadventures.com is certainly one of the most entertaining of the bunch. The 404 page hosts an animated cartoon complete with voice-overs and an amusing advertisement for the group's cartoons and merchandise.
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.