I saw the ISS with military grade binoculars when it passed overhead one time. Actually, it was more like a high-powered portable laser range finder. It was a pain to keep in view though.

As for UFOs...... I don't believe they're ETs. If I was one, why would I waste my time playing these little hide n seek games? I'm not going to beat around the bush. When I show up, I show up. If I was a conquering ET, I'd start vaporizing everything in sight.