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Not all 404 pages have to be static text or images. You can have, for example, techie artist Steve Lambert's self proclaimed most awkward 404 “movie” page on the Web. Which, I admit, is indeed incredibly awkward. http://visitsteve.com/404.html
Then, of course, there's the famous—or is it infamous?--Nosh, a mobile app. for tracking down restaurants. And, ahem, sending out elite ex-special forces operatives to track down missing Web pages. http://www.nosh.com/404 Oh, but guys, the page you gunned down? It's not a code 500, it's a code 410: the requested resource is no longer available at the server and no forwarding address is known. This condition is expected to be considered permanent.
Did you ever wonder what HAL, the computer from the movie 2001 might be doing in our world? Well, he might be bitching and moaning over at the University of Illinois at Urbana-Champaign ACM chapter's Web page. http://www.acm.uiuc.edu/sigops/roll_your_own/SIGOPS