This will sound more like a robot question, but I already know they're a robot and that they were up to no good. My Error Log was unusually fat so I took a closer look and found
21 May 22:20:32//scripts/setup.php
21 May 22:20:32//admin/scripts/setup.php
21 May 22:20:32//admin/pma/scripts/setup.php
21 May 22:20:33//admin/phpmyadmin/scripts/setup.php
21 May 22:20:33//db/scripts/setup.php
21 May 22:20:33//dbadmin/scripts/setup.php
21 May 22:20:34//myadmin/scripts/setup.php
21 May 22:20:34//mysql/scripts/setup.php
21 May 22:20:34//mysqladmin/scripts/setup.php
21 May 22:20:35//typo3/phpmyadmin/scripts/setup.php
et cetera for a total of 94 nonexistent php and/or sql pages in 47 seconds. Mostly variations, for example phpMyAdmin-2.2.3 all the way up to 2.8.2. The double slashes are in the original.
Question: Can someone explain in words of two syllables what this evil robot (I instantly htaccessed 'em, of course) was trying to find, and what it most likely intended to do when it got there? I don't have any php-type stuff at all, hence the request for two syllables or less.
It's a teeny little site, mostly personal, so they can't have been motivated by anything beyond boredom or random malice. Unless they were looking for a way to sneak upstairs-- can you do this?-- and thought a small site was the best way to slip in unnoticed.