 The crawling steak was done by using a real steak which was laid  over a slot cut between the tiles in the counter top. Two wires were  fastened to the bottom of the steak and a special effects operator,  hidden under the counter, simply moved the wires to make the steak  crawl like a caterpillar. A similar operation was done when Diane  presents to Steven the chairs that move across the room by  themselves. A wire was fastened to one of the chairs legs under the  set. An operator first wobbled the chair with the wire, then dragged  the chair across to its destination.