The HyperText Transfer Protocol (HTTP) indicates a lot of information in the "status code". Everyone is of course familiar with codes 404 ("Not found"), 200 ("OK"), and 500 ("Internal server error"), but there are dozens more codes, each with their own precise meaning.
If you're having trouble remembering which code is which, or don't understand a particular code and would like a more "vivid" example, head over to Flickr, for this delightful set of HTTP Status Codes illustrated by cats.
This is definitely the geekiest humor of the year!
I particularly enjoy