If you were ever curious about the various status codes of HTTP (HyperText Transport Protocol) [1], or if you like cats (or both!) then you might want to check out HTTP Status Cats [2] (link via BoingBoing [3]).
[1] http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
[2] https://www.flickr.com/photos/girliemac/sets/72157628409467125/
[3] http://boingboing.net/2011/12/14/http-status-cats-by-girliemac.html