The magician tells the audience about his recent visit to an old victorian house, believed to be haunted. He shows the audience a souvenir from his visit: a large brass bolt and nut. The nut is screwed onto the bolt and everything is placed on the table. The magician covers the nut and bolt for just a moment with a silk handkerchief and when the cover is removed, the audience can see the bolt has unscrewed itself from the nut! Carefully crafted in brass.