This document provides advice on what to do when an idea fails through examples of famous entrepreneurs who experienced failure and rejection before success. It outlines a 10 step KALMANG process to come back better which includes keeping cool, acknowledging failure, learning from feedback, and negating negativity. Key messages are that failure is an opportunity to improve and that enduring challenges makes success sweeter. Famous entrepreneurs discussed who failed multiple times include Walt Disney, Colonel Sanders, Fred Smith of FedEx, Henry Ford, Steve Jobs and Sigmund Freud.