////On QI the other night it was asked how is it that whenever anyone draws an alien, they invariably draw the classic Grey? Do Greys actually exist? Or is it because they are a folkloric figment of our collective cultural imaginations? If human history tells us anything it's that we have an amazing capacity for making stuff up & convining ourselves it is real. There are no flying saucers*, just random lights in the sky becoming figments of our collective imaginations, and all the more fascinating because of it.////

You make the same mistake as believers: UFOs are piloted by aliens from other dimensions or beings from other planets. An idiot should know that cannot be true. But there are UFOs and they ain't no Chinese lanterns.