With the Xbox Live version of Minecraft, anime fans thought now would be as good a time as any for this. What's this? This is anime Haiyore! Nyaruko-san mashed with Minecraft. The original light novel and anime stars a Cthulhu deity named Nyaruko and the title refers to "crawling" or "creeping".
Fittingly, the mash-up is titled Haiyore! Creeper-san.
It looks like the original anime opening has been wiped from YouTube -- a shame because it's amusing. You can catch glimpses of it in this live concert footage in which the theme was performed.