There is a feature you can add to htaccess that shows an alternate image if you try to hotlink the file.
You can use this to show goatse, tubgirl or the most disgusting image I can find
You could also use a image with the writing "visit
www.xyz.com for more"
http://www.htaccesstools.com/hotlink-protection/
It's under Blocked Image URL
I use this sometimes to fuck the users of fusker.lewww.com, so they get a picture of a penis cut in half rather than my pics
