The document discusses five marketing horror stories that resulted from avoidable mistakes. Horror story #1 involves using stock photos without checking if others were also using them. Horror story #2 is about using QR codes and domain names without renewing them after campaigns end. Horror story #3 is about giving away too many prizes without understanding the long-term outcome. Horror story #4 is rolling out great promotional ideas without setting rules and limits. And horror story #5 involves social media campaigns that had unintended consequences. The document recommends building a diverse team, collaborating, increasing chances to catch mistakes, maintaining approval processes, and creating visibility to prevent these types of marketing disasters.