You have a few options. Any requests coming from that server network should be goatse-d on all images. Or, since they're hosting from Germany, make sure to th

You have a few options. Any requests coming from that server network should be goatse-d on all images. Or, since they're hosting from Germany, make sure to throw in some pro-nazi stuff and "holocaust didnt happen" stuff, and then turn them in to their government. Basically, you can either just use normal troll defacement, or you can poison them with illegal to their location content. Your choice.