Spike in Hits?

So, I'm a bit OCD about keeping track of hits to my blog, and something strange happened today. Around 9:45 last night (Central Standard Time US) I had a 155 hit spike out of Russia. Seems to be primarily Windows operating systems running Internet Explorer (from what I can figure looking at the stats, anyway). This is the second time this has happened. None of the hits seem to be from links or to specific posts, so it must be just the main page. Any thoughts, apart from "Damn Commies"?