I would much rather http://fuckshit.example.com/ http://fuckshit.example.com/ end up at a browser error page instead of being redirected to my site. This preven

I would much rather http://fuckshit.example.com/ http://fuckshit.example.com/ end up at a browser error page instead of being redirected to my site. This prevents the clever person who decides to link to me with http://fuckshit.example.com/ http://fuckshit.example.com/ as the URL. (And I use mod_rewrite for naked domain to www redirect, so I'm familiar with this.)