Rule #1 - Tell visitors clearly that the page they're looking for can't be found. - I'm not sure what a "dead page is" and, nor why a page "has gone zombie". It then gives me some cool madlib functionality that clearly distracts me from my original goal - which was to find some page that no longer exists, but is now not clear whether it exists or not. This attempt to use the 404 as a marketing page (it clearly is as it tells you to share it at bottom) is extremely confusing to the user and only has one goal in mind, which is to get more people to their site. It neglects the users goal, which is to simply find the page they were looking for.
I think "best" in this context means "most amusing" rather than "the best design from a technological and/or user experience perspective". However I'm guessing from the tone of your post that the humour of this page was lost on you. :P
Rule #1 - Tell visitors clearly that the page they're looking for can't be found. - I'm not sure what a "dead page is" and, nor why a page "has gone zombie". It then gives me some cool madlib functionality that clearly distracts me from my original goal - which was to find some page that no longer exists, but is now not clear whether it exists or not. This attempt to use the 404 as a marketing page (it clearly is as it tells you to share it at bottom) is extremely confusing to the user and only has one goal in mind, which is to get more people to their site. It neglects the users goal, which is to simply find the page they were looking for.