I know it's not windsurfing but I think we can all identify with how much this would hurt. It was taken during the final race of the 18' skiff worlds this weekend on Sydney harbour.
They showed it on Channel 7 news last night. they were trucking along and all of a sudden they hit a reef and instant stop. Didnt look like they broke much anyway. Gotta hurt.
They snapped their board and took a big shark bite out of the bit that was left. The thing that you didn't see was that while they were being towed off, Club marine sailed around the tow boat and hit the same reef while going back upwind.