poltergeist

The title of this article should really be `remote-controlled poltergeist-imitator`. By operating a miniature ultrasonic transmitter concealed for example in one`s jacket pocket, a receiver hidden somewhere in the room will simulate the sound of a poltergeist loose in the house. Should the authentic poltergeist then fail to put in an appearance, the ambitious ghost-hunter can ensure success by virtue of his electronic stand-in.