One guy was standing right on the edge of the crop circle as it was being formed. He looked up and saw a flying saucer with colored lights. He made drawings and they are posted with the report.
The report is far more than this instance, however. Linda Moulton Howe includes other reports of people who have seen the circles being formed:
http://www.earthfiles.com/news.php?ID=1776&category=EnvironmentI read the whole article. Fascinating, especially the part about how the witness saw the stalks being interwoven:
I did look down and kept watching the formation of the circle. It was kind of swaying and circling, each stalk. Then some how the stalks were going down and when they got down, they were still circling, but on a different axis. When they were circling on an angle, they were hitting each other and some of them were getting entwined. That’s what I found intriguing.
Some force (from UFO?) was shaking the wheat with two different forces at once and the plants got down pretty flat. We went over and looked. The stems were not broken. That astounded me! I couldn’t find any of the grains that were broken. Cher