Some Strange Referrals

There was a strange sight awaiting me in my referral logs today.  Yesterday, between 1600 and 1900 PST, I had 65 visits to this site as a result of search engine queries relating to Dungeons & Dragons and an ArgumentNullException (see graphic below).  What's that all about, then, eh?  My guess is some online multiplayer RPG started throwing exceptions around that time, but it would be interesting to know for sure.

One of many neat things about Google Analytics is it's ability to include / exclude keywords from the referral results on demand, so I was quickly able to filter out these strange visitors to see the keywords used by the remainder of my visitors.

Oh, and in case you're wondering - of those 65 visitors, 63 came via Google, with one each coming from MSN and Yahoo.  Talk about market dominance!