This is the most classic error message for a social website login I have ever seen!
I discovered it after using an incorrect username on www.verb.com (http://www NULL.verb NULL.com)
I had completely forgotten the last time I had seen this error message, must have been the last time I had a paper jam with an old mangy HP Laserjet III my Dad used to keep at his offices!
(http://www NULL.freedomgeneration NULL.com/wp-content/uploads/2007/04/pc-load-letter NULL.png)
For more info on the history of the error:
http://en.wikipedia.org/wiki/PC_Load_Letter (http://en NULL.wikipedia NULL.org/wiki/PC_Load_Letter)
(http://www