At my mother's birthday party recently, somebody made the comment that my cousin's wife seemed to have a 'thing' for purple because she always wore something that colour. My cousin muttered a cryptic remark under his breath. We didn't really get what he was on about until his wife nipped out to their car and returned with her perfectly colour-coordinated purple SheWe. She took great delight in explaining how it worked. I was afraid that she might insist on demonstrating it !