I had a weird encounter when I was quite young. Something "paranormal" anyway, I was climbing rocks at a lumber camp deep in the Sierra Nevadas far enough from civilization that we didn't have electricity or running water, when I heard a high-pitched mechanical noise a ridge over. I climbed up to see what it was but by then it has moved down along a dry creekbed and went around another ridge, moving away faster than I could even begin to follow.
I did examine the area and found no sign of tracks or anything mechanical in the sandy soil near the creekbed. It could perhaps have been some kind of flying device but this was in the early 80s, before Drones were a thing and when even the remote control helicopter was a technology only a few years old and not to be found in a deep backwoods logging camp where I was the only kid. A manned craft wouldn't be likely to be flying so low it was caught in between the ridges of the mountains.
I also regularly saw a UFO I named "Chitty Chitty Bang Bang" as it was two extraordinarily bright white lights, far brighter than any other plane I've seen and not colored like plane lights are, ogether like headlights, that flew at low elevations and tended to follow the same path over and over again every night at the same time. I don't presume it was aliens but I never have figured out what the plane with car-like headlights flying low was.
