When creating an offline copy of a website a while back. HTTRACK accidentally farmed some data off a website. Not sure how it farmed the data, since normal navigations through links etc couldnt get to the content, but at a website that I was able to make an offine copy of there were family pictures etc that had nothing to do with the original website, but they must have been there at the webserver for HTTRACK to crawl and farm them. I deleted the 60mb of someones families photos since that wasnt what I wanted, I just wanted a static copy of the text content mainly.
There are many tools out there to farm data, and if data is not well hidden or protected on the server side, stuff like this happens.