I've never witnessed a UFO, but I know three folks who have. All of them credible (to me, at least). I don't need to see a kangaroo with my own eyes to believe that they exist.
They watched it float around for a bit, then it took off and turned into a point of light that was ... a star. It was dusk, and stars were beginning to show. They hung around outside for as long as they could watching the star ... and it was just a star.
Husband doesn't talk about it much, never has, but when I've gotten him to discuss it, it basically boils down to this: he struggled because he'd seen something supposedly physically impossible and by definition unbelievable ... yet he knew what he saw. They saw what they saw. The damned thing had windows, for crying out loud!
He was then faced with either having to convince himself that he didn't see what he and fellow witnesses saw ... or he had to face a truth that was just as scary -- that he did see it. Essentially what it did was make him realize that just because "science" or common sense or whatever says something -- like a noiseless anti-gravity machine -- is physically impossible, it isn't neccessarily true. So he has gone on to do "impossible" things, including designing a large structure that engineers told him repeatedly, would not stand up. They were wrong, he was right ... the thing has been up, standing, and operating successfully since 1994 and we hope for many decades more.
The understanding that "impossible" is subjective and illusionary, was what came out of his sighting of the thing.
Solamente and other folks who've seen what others seem to think you only "believe in" -- how has it affected your views of "conventional" reality?