On Christmas Eve, Nathan thought it would be nice to buy his wife a little gift for the next day. Always short of money, he thought long and hard about what that present might be' Unable to decide, Nathan entered Debenhams and in the cosmetics section he asked the girl, 'How about some perfume?' She showed him a bottle costing $150 'Too expensive,' muttered Nathan. The young lady returned with a smaller bottle for $100. 'Oh dear,' Nathan groused, 'still far too much.' Growing rather annoyed at Nathan's meanness, the sales girl brought out a tiny $20 bottle and offered it to him. Nathan became really agitated, 'What I mean', he whined, 'is I'd like to see something really cheap.' So the sales girl handed him a mirror.