Perhaps it's their eye-catching, smile-producing, oh-so beautiful design which makes them oh-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 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.