Hi,
Yes crop circles are fake ... hahaha
I saw a documentary from the Belgium TV proving it's an hoax ...
HOWEVER
Of course you can create a hoax and then prove it's a hoax ...
Look at this interview and the following parts ...
It looks quite real that authorities are pressing for it to look like a hoax
http://www.youtube.com/watch?v=Qhetj7vklfU
Cheers