For most of us, thunderstorms are all about lightning bolts, dark clouds and the occasional dramatic sky.But every now and then, nature puts on a show so extraordinary that it looks straight out of a science-fiction film.That's exactly what happened recently over Tibet, where a photographer captured one of the rarest atmospheric spectacles on Earth – giant red flashes of light shooting above thunderclouds, accompanied by an even rarer green glow.The breathtaking footage has now gone viral, leaving people around the world wondering if what they're seeing is even real.The answer is yes.And that's what makes it so incredible.The visuals…