Actually this reminds me of a story from my Bio teacher back in Highschool.
As the story goes, it was him plus a few friends swimming in this pond/quarry type of deal. Like a lot of these places there was lots of garbage and other crap that people had thrown into the pond over time. You know when you install chain link fence there's these green steel bars you hammer into the ground? Well one of these was located on the bottom of this pond pointing straight up. Well, my teacher's friend jumps off into the pond goes to the bottom, hits the pole. The pole hits him near his "boys", pierces the skin and goes up under the skin up his stomach. He didn't die, but he's now half the man he used to be.
Now, be glad you just hurt your chest a little bit.