My sweetie has seen two UFOs in his life. (Not necessarily aliens, but UFOs.)
The first was long before I ever knew him. He and his sister were kids and went outside to see Skylab. They saw Skylab cross the sky, then right behind it, saw another object cross in the same path. He describes it as a round light that followed Skylab all the way across the sky as far as he could see.
The second was just a couple of years ago. He saw a metallic, reflective, round object hovering beside a cloud over the bay near our home. He watched it for a while, and it moved side-to-side beside the cloud. He went and got my son (then 12 years old) to come and look at it, too. While they were watching it, both of them saw it flatten out and accelerate across the sky. As it passed through the edge of a cloud, they could see the outline and it appeared as a dull, metallic, oblong shape.
He's a goofball, but he's not crazy. And others have witnessed both things he saw.
I never get to see anything, though. But, I keep looking.
Bless you and all, but I wouldn't rationally believe a word you say unless I was looking over the shoulders of the eyewitnesses themselves!
I only know what I've seen, and I sparingly rule despite that, that it is possible that other people have seen things.
What I saw is what I saw, and under pain of whatever, that's what I saw, and can comment not on anything else with any surety. I saw a cylinder. Period.