WSJ.com - Burn, Prairie, Burn:Tourists in KansasCome to Torch Grass
http://online.wsj.com/article_email/0,,SB111559360425227722-IFjfINnlad4nJuobX6Gaq6Em4,00.html
I had a friend in high school whose little brother did this to the field behind their house every few months, for free. Only, well, it wasn't really a good thing.