You may notice in some sites that the sidebar ads are linked (however tenuously) to the subject.  There is no human intervention in this- the site owner sells ad space, and a ‘bot’ picks out keywords and drops an ‘appropriate’ ad in.  However, the ebay one seems to have excelled itself

North Korean Army
Fantastic low prices here. Feed your passion on eBay.co.uk
www.ebay.co.uk

I would- but frankly I’m not sure where I would put that many tanks! (Les’s site StupidEvilBastard.com is a master at these- he posts a rant at religeon, and in the sidebar is a link inviting you to be ‘saved’!)

Any other inappropriate ads you’ve seen?