The only "UFO" I've seen was in NV (near Reno) one night. I was driving out to my campsite when I noticed something that looked really strange on the horizon and coming toward me. I shut off the engine and jumped out to get a better look and listen. They were 5 sort of triangular objects in a V formation that were either very large or close to the ground. The only thing I could see was what looked like sparks coming off the leading edges and trailing behind. They were moving very fast and made no sound that I could detect.
I thought they could have been some sort of advanced planes, but it appeared that they flew straight over Reno, which surely the military would not have done.