I like to "stretch my mind" sometimes, so to speak.. here is two great videos about the crop circle phenomenon. Hoaxes or not, I find it truly inspiring. The ones who are not always happy with this are the farmers! 
I'm posting this now because it's the season! From May to early September, each year, increasingly complex designs appear in the crops, and you can check the cropcircleconnector.com website during this time and see the new circles just days after they are found and photographed.
"A visual introduction to the crop circle phenomenon. Presenting some of the most beautiful & intriguing formations, basic stats and a stack of useful links for further research."
Crop Circles: Enigma & Paradox
"The German documentary New Swirled Order looks at crop circles in a scientific and critical way, trying to get at the mystery behind these incredibly intricate geometrical designs found in fields all over the world."
To make this complete this is one group of self-proclaimed crop circle makers, they don't claim to make all of them, but clearly there is a proportion of man made circles:
http://circlemakers.org

I'm posting this now because it's the season! From May to early September, each year, increasingly complex designs appear in the crops, and you can check the cropcircleconnector.com website during this time and see the new circles just days after they are found and photographed.
"A visual introduction to the crop circle phenomenon. Presenting some of the most beautiful & intriguing formations, basic stats and a stack of useful links for further research."
Crop Circles: Enigma & Paradox
"The German documentary New Swirled Order looks at crop circles in a scientific and critical way, trying to get at the mystery behind these incredibly intricate geometrical designs found in fields all over the world."
To make this complete this is one group of self-proclaimed crop circle makers, they don't claim to make all of them, but clearly there is a proportion of man made circles:
http://circlemakers.org


but I watch a lot of sci-fi and discovery channel.