Bewenched - 5:19 am on Dec 4, 2012 (gmt 0)

Mozilla/5.0+(compatible;+GrapeshotCrawler/2.0;++http://www.grapeshot.co.uk/crawler.php)

89.145.95.2

It did not ask for robots.txt

And kept hitting pages over and over again.

Looks like some sort of media ad bot, but the pages it kept hitting had no ads at all on them.