Sure, it's the world's largest billboard, but the idea of writing on the moon sounds like cartoonish supervillainy. It also raises the question: Are soulless multinational corporations really soulless enough buy ad space on the moon? Who knows how serious this company is, or if it's a simple cash grab, but if they succeed, those ads could be there for a long time. At least until we can send a mission up to tamp out the message. By that time the product the ad is plugging may have gone the way of Pan Am or Crystal Pepsi.