The rest happened with startling swiftness. All at once my friend began to screâm as he stood by the window; scream and claw wildly at empty air. In the lamplight I saw his features contort into a grimace of insane agony. A moment later, his body rose unsupported from the floor, and began to bend outward to a back-breaking degree. A second later came the sickening grind of broken bones. His form now hung in midair, the eyes glazed and the hands clutching convulsively as if at something unseen. Once again there came the sound of maniacal tittering, but this time it came from within the room!