My sister attempted to body board waves at Waimea Bay in Oahu. Unfortunately, she got caught in one of the biggest waves that day, lost control, and ended up completely vertical (head first!) in the wave. She landed with her head bent backwards and the full weight of her body placed on her neck. Truly a miracle that she is not paralyzed. Pause at various frames when you see her upside down...you can see how hard she landed. The wave ripped out her contact lens and her face was drug across the sand. She felt a huge crack in her mid back and her neck. She said as she washed up in the wave her first thought was that she broke her spine.
Oh yeah, and she also got stung by a jelly fish this same trip.