What are UFOs portrayed in movies based upon?

That's a very interesting question. Sometimes people say that people who claim to have had UFO experiences have actually been watching too much science fiction. But actually I find that the true position is the exact opposite of that. Science fiction writers and famous film directors actually go out and talk to UFO witnesses about the things that they have seen. A classic example of this is the film Close Encounters of the Third Kind. Steven Spielberg, went out researching and he used a chap called Dr J. Allen Hynek as one of the consultants on the film. Hynek used to run the US Government's UFO project. Interestingly, right at the end of the film when the mother ship comes over the base, Spielberg rated Hynek's contribution so highly that he gave him a cameo role in the film. He's the old guy with a pipe. So film-makers get all their information from UFO research, not the other way round.