I saw once a ufo which hovered 20-30m above the ground. I don’t think that anybody was inside tho, as it was shaped like fishing net. As it hovered it changed its shape and aligned itself, it moved like a fishing net in water. Where the knots would be, there were spheres. It was pretty huge, as big as a house for 5 people. But at the same time, it was too small for anyone to be inside.
A friend and I saw it, so I know that I did not imagined it. Because right after that happened, I doubted my own experience. However, after that, I believed in aliens.
So, yes. I do believe in UFOs as I saw one. And Yes, I believe in Greys, as I saw them as well. (In my mind)