Crop Circles And Pictagrams
I would love to see a group of humans make the alien face or any of the large, complex circles in the dead of night and show how it can be done under the same conditions as we find them....and show how they avoid detection and leave no trace of their presence behind!!!
Most of the videos that try to show that are made in daylight and are not of the large, complex variety.
"Light travels faster than sound. That is why some people appear bright until you hear them speak."
Larry the Cable Guy