Given the givens,
a 100% hoax would be a more impossible phenomena than UFO's.
I agree
Same thing with crop circles. There was one I saw that was stunning, fantastically complex, something like a hundred acres. Engineers and surveyors were asked about if they could create it and they said "Yeah, give me twenty guys working ten hours a day, and we might do it in two weeks"
But it appeared overnight, no doubt a couple of college kids with poles and rope and a couple cases of beer.
For every completed crop circle we see, there should be three more that are abandoned, unfinished.