There's a lot on that first link--wow! There are other Larry King segments that follow, after you finish watching the one listed above.
I saw one when I was very young. It was huge and looked very similar to the first one in the clip. I was traveling with my brother's girlfriend in a car on a rural highway out in Nebraska. We were coming home from a swim out at the quarry. The UFO followed our car for the longest time, just silently hovering above us. I would say it was at about the height of an eight-story building. It followed us for 10 minutes or so. I said nothing to my brother's girlfriend because I knew she'd do something to chase it away.
It didn't scare me, just like when I saw a ghost, it didn't scare me, either. It felt like a natural phenomenon.
Finally she asked me what I was looking at and I said, "There's a UFO that's been following us for about 10 miles." She knew I wasn't joking and she quickly pulled the car to the side of the road. We both jumped out and at that point the craft moved out so fast that it appeared to sink into the ground. She saw it, though, both close up and as it disappeared.
Really something. I will never, ever forget this. The sight is emblazoned in my mind.
Cher