It is anger, and not fun, what drives innovation

"Anger doesn't appear on many business plans and he feels this is a great shame because it's the most important emotion when looking to create a new product or service. The reason is straightforward: angry people approach a problem with more heightened feelings. They can then equate a solution to the problem with relief. If the answer leads to the end of anger, it's likely to be a winner in business terms."

"Product managers worrying about adoption curves for their new application should stop concentrating on features and look to the emotions and the experiences of their customers. Consumers change behaviour through anger. Skype, for instance, tapped into a general feeling in the market of "I'm angry at my telco"

http://itc.conversationsnetwork.org/shows/detail1877.html