The Japan Organization for the Promotion of Renewable Energy has devised this "solar-powered fan hat," according to Tokyo-based Plastic Bamboo. It has a solar panel perched precariously on top, which powers a fan poking through a hole in the bill of the cap.
It's not that we have anything against the idea but, come on, look at this thing. Whoever is willing to wear one of these probably has a bed full of Dashboard pillows too. As for us, we'd rather just fry.