Okay! If it's real, someone took a real long time to smash a bunch of corn stalks in a very clever way.
If it's not, it's a real good use of Photoshop.
Either way, it was done by a human, a computer or a machine made by a human.
If you want to believe it was extraterrestrial, then have at it. I like to think there is intelligent life outside of earth. But I would only hope that if there are capable of making a spacecraft that can travel thousands, if not millions, times the speed of light to make a trip here, they would have something better to do than flatten cornstalks.
I actually lean towards the twist in the movie "Signs" that actually we look like one big stockyard to aliens. Mmmm...human, the other white meat.