I heard a story about Carbon and their grassburrs. Upon viewing the field pregame, the Sidney players noticed quite a few armadillo holes filled with caliche. This was in the mid-fifties. Sidney had a large, tough RB, after he was tackled the first and only time on the nice green grass filled with grassburrs, he came back to the huddle and told his team mates "if I get tackled again it will be on the caliche or I'm just not going down". He kept his word.
