IDEO: Big Innovation Lives Right on the Edge of Ridiculous Ideas:

“Those skeptics are in every walk of life. You can certainly combat it with the experimenter role. Show people it’s possible, don’t just tell them. It’s always been the seemingly improbable, boundary-pushing ideas that have created this world around us and none of that would have been possible if they’d listened to all the people who said it never would have worked. We’d still be living in caves if we relied on the skeptics.”

Also see: From Ridiculous to Brilliant: Why We Play at Work