What do you think crop circles are ? Aliens ,God a hoax or unexplained natural phenomena ? Sky Crop circles?

Crop circles are made by US. It's not hard to do. It just takes time. I saw a special on TV about this and there was this British man showing how he made elaborate crop circles with a two by four, some rope and a wire which he attached to his cap and made a little site out of it. He lined the site up with a bulding so he could make straight lines. He pushed the wheat down with the two by four with his feet. The two by four was attached to rope which he held. Simple, cheap, and fast.