Among other retailers, radio shack used to sell a solar cigarette lighter. It consisted of a polished metal parabolic mirror attached to a hinge that let you orient it in several different positions, and a clip which held your cigarette. When properly oriented, it would cause sufficient sunlight to be reflected onto the end of the cigarette to set it afire so that you could smoke it. The solar cigarette lighter has gone out of fashion but was once a common knickknack and was often seen attached to motorcycles.