Farmers used to be letting tourist- types get close to the earth, by letting them thresh their own grain. That might not be the case any longer, since the law suits began.
Article here.
OK, here's a tort analysis on the law suit: The farmer will have to defend based on the adequacy of the warning, and what a reasonable person would consider dangerous. The article mentions that the warning sign had a stick figure, with a limb getting injured.
