The full collection of 1,001 + examples from the amazon Best Selling book, “What’s Your Purple Goldfish? 12 Ways to Win Customers and Influence Word of Mouth” A purple goldfish is any time a business goes above and beyond to provide a ‘little something extra’ for the customer. It’s that unexpected surprise that’s thrown in for good measure. Also know as marketing g.l.u.e (marketing by giving little unexpected extras).