Here’s one explanation for crop circles:
This English woodcut pamphlet was published in 1678. It tells of a farmer who swore he would rather have the devil mow his field than pay the high price demanded by a laborer.
According to the pamphlet, that night his field appeared to be in flames, and the next morning it was found to be mowed to supernatural perfection.
Maybe so, but if that’s what causes these things, the devil’s been getting awfully fancy lately: