The Unreason Plague: Spec-fic

The unreason plague has spread beyond the boundaries of our watch, he thought, chilled to the bone, when he saw his lead commander suddenly drop his rifle and begin spinning in place, his arms upstretched to the night sky and a ragged howl tearing its way from his throat. We have failed. He ran forward and lowered his rifle to kill his lead commander. He would have done it, too, though he had known the man for three years and knew his family, if he hadn't heard the commander moaning words. "Why, why, why?" the commander demanded. "She was the age of my daughter--"

Inspiration: 'unreason'
Story Potential: High.
Notes: Nifty. I like the idea of an unreason plague. Could be zombies in disguise, could be something entirely else, but it is a nice setting for a world in collapse, holding actions, etc. Would need more by way of actual plot, of course, but could go either sci-fi or fantasy. Or horror.