I noticed that Stardog puts database directories into $STARDOG_HOME and if you set $STARDOG_HOME to be the base directory that you unziped stardog you end up with the database directories alongside your system directories such as client, bin, docs, system, and webconsole. No problem there. So I wondered, what would happen if you created a database with the same name as one of those directories. I think I tried "system" first and got an error message "reserved database name". Undeterred I tried "client". It worked and just littered the client directory with the database files but when I went to delete the database it deleted the entire directory erasing all the Stardog client flies as well.