A few people have explained over and over (on several documents) on how they form the crop circles. It is a lot of work!
Perhaps, but we had an incident near my home just two weeks ago during the dark hours when a major thunder and lightening storm storm series was rolling through all night. Three separate oats fields, clear at dusk (relative drives right past them on the way home in the evening), were pocked with patterns at sunrise. These patterns were several acres in size, arrayed over rolling terrain, and interlocked in nature. Our local MUFON leader chalked them up to 'caused by wind patterns'. Of course, this is the easiest explanation, but one wonders how the wind did it over rolling terrain, remaining within fenced enclosures completely, but coming as close as three yards to the fences in places.