Yes. I have seen a UFO.
My sighting occured at approximately 8:30PM on Tuesday, October 8, 1968.
I was the publicity director for a performance of Up With People in Sacramento, California, sponsored by Sing-Out Sacramento, the Sacramento Union Newspaper, and KOVR Television. The performance was that evening and it had started at 8:00 PM before a crowd of approximately 8000 people in Hughes Stadium at Sacramento City College.
I was standing behind the risers which were placed centered on the 50 Yard line facing west. The crowd was all on the stadium seats facing east. I was getting some really neat photographs of the Up With People cast sillouhetted against the stage lights.
The first act was close to ending when I noticed a large disk shaped object moving slowing from South to North above and behind the crowd on the bleechers. The object, to my eyes, was about twice to three times the size of a full moon, but appeared ovoid with the short axes east to west, long axes north to south. It glowed with a pearly luminescence and was moving quite steadily and silently. This "saucer" moved from my left, toward my right, and then stopped... about 20º to my right from being directly in front of me. I don't know how long it stayed there, but suddenly, it shot straight up... dwindling in a few seconds to a very small dot. It then moved at a high rate of speed north until it disappeared into the city lights.
The only other witnesses were members of the Up With People cast. A year later I was a student at Mackinac College, Michigan, and my roommate in the dorms was Ollie Howe, one of the cast members. He said the UFO was the talk of the UWP buses for days after that... some members saw it, others didn't and refused to believe those who saw it. Ollie saw it.
Remember I mentioned I was taking photographs? Stupid me stood there with my jaw no doubt on the tongue of my shoe and didn't take a picture!
Here's a link to Freeper sightings, mine included:
http://www.freerepublic.com/focus/f-news/1123484/posts