" A slogan that accurately conveys the essence of your Purple Cow is a script. A script for the sneezer to use when she talks with her friends. The slogan reminds the user, “Here’s why it’s worth recommending us; here’s why your friends and colleagues will be glad you told them about us.” And best of all, the script guarantees that the word of mouth is passed on properly – that the prospect is coming to you for the right reason. "

― Seth Godin , Purple Cow: Transform Your Business by Being Remarkable