Amazon Elastic Compute Cloud (EC2) services were disrupted for a few days in last April. Thousands of companies lost their services completely in this period. There is no doubt that Amazon, the leading Cloud Service Provider, has the expertise and good practices to implement, operate and maintain the highly reliable and available service. The incident might have resulted from a chain of unprecedented events or might only be a matter of a simple human error. Regardless of the reason, Amazon must have learned its lesson from this incident and probably will improve its service even further in the following months. On the other hand, what are the lessons a cloud customer should learn from this incident? I sought the answers between the lines of the "Summary of the Amazon EC2 and Amazon RDS Service Disruption" report published by the Amazon Web Services Team.