Some crop circles are 'real' in that they are made by aliens, in an effort to communicate. The human made crop circles are actually an effort to communicate back and the tales of mischief and fakery are just a cover! The first steps to overcome communication barriers often involves mimicry.
Seriously though, I'm surprised to see that theory hasn't been put forth before, it does make a certain kind of sense even if it is totally unfounded.
Edited by bison, 14 January 2013 - 06:07 PM.