Perhaps it's their eye-catching, smile-producing, oh-so beautiful design which makes them so popular. Or maybe it's the thought that having one tucked in your purse or wallet might just help you attract the real thing. Or the knowledge that these little suckers can help your business attract more clients. Or that customers love them and they sell like hot cakes. Or maybe it's simply because they're heaps of fun. Who knows? One note. A million and one uses.