While going through my server logs tonight I keep seeing logfile entries like this:

a.b.c.d - - [13/Jan/2008:22:59:49 -0500] "GET /pivot/archive/2007/11/16/serious_vulnerability_found_in HTTP/1.0" 404 321 "http://drwho.virtadpt.net/archive/2007/11/16/serious_vulnerability_found_in" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; Win64; AMD64)"

Someone's going to articles on my website that exist, but then they're clicking a link someplace in the article that's sending them to the same URL prepended with the string /pivot, and I can't figure out where or why they're causing …