Do you recollect the greatest fun moments in your life ? Those were the moments when there were no boundaries. You dropped your ego, you said silly things, you had no image to protect. This state of egolessness enabled you to experience the moments of greatest joy, ecstasy, and fun.
Now, just imagine if your intelligence wanted to have fun. What would happen ? It would cross all boundaries. It would not be bound by ego. It would fly high into the deep sky. It's flight could virtually go in any direction. Totally unpredictable. When this happens, you reach those magical moments of creativity.
Creativity is intelligence having fun.