I haven't seen one but about 6 people I know, who are totally sane and were not on drugs all had an encounter out camping. A quietly humming UFO lit up their whole campsite like day light. They were all freaked out including the dogs and they could see it clearly, like nothing they'd seen before. The light went out and they watched it follow the river they were camping beside. It moved at right angles, had no visable sign of propulsion. Definitely UFO material. All of them were blown away by the experience but it's not often talked about and they didn't report it. I don't know why.