Parasites are raising an army of zombie wasp queens to do their bidding, and it's a good thing that these parasites aren't more ambitious, because they'd probably be well on their way to taking over the world by now! The parasites cause common wasps to believe that they are queens, rejecting their normal caste and acting as self serving loners in wasp society: Infected P. dominulus — better known as common European paper wasps — reject their genetically preordained roles, abandon their hives and embark on a long, macabre journey during which a few live for a time as queens, albeit murderous queens. Read on about this fascinating example of parasitic mind control at the Wired link below, and pray these little critters don't develop a taste for human blood! Link
Too late, Zeon - from that symptom, it appears that the parasite has infected many people I know.