pageoneresults - 4:06 pm on May 18, 2011 (gmt 0)

(I'm thinking the "p" word) then possibly they will take the link off their site.

Careful! I'm not too certain you want to create that type of association. I think you'd be better off serving a custom page from your site.

I think I'll do that.

Careful! These may be considered extreme measures. I served the 403 with a custom page that let the visitor know they were Forbidden from visiting the link they followed.

If you want to be professional about it, you could 302 the referrer to a linking policy page. Not as brute force as the 403 and you get to keep the inbound link equity (if any) to the original document.