The requested resource
is no longer available on this server and there is no forwarding address. Please remove all references to this resource.

It's pretty easy to cause a 410 - simply insert the following line in your .htaccess file:
Redirect gone /path_to_file_or_directory
Apache will then block access to the file or entire path. And it probably confuses people, too, since they won't have seen such an error before...