(NEWSER) – Florida isn't the only  state dealing withsinkhole troubles:  On an Illinois golf course Friday, golfer Mark Mihal suddenly dropped into one.  "I was standing in the middle of the fairway," he tells the St. Louis Post-Dispatch. "Then, all of a sudden,  before I knew it, I was underground." He was rescued from the 18-foot-deep,  10-foot-wide hole by friends and the golf course general manager; one friend had  to climb down and tie a rope around Mihal's waist, because he dislocated his  shoulder in the fall.