I actually knew a guy that broke his neck diving into a pool to catch a water polo ball. We were on the HS swim team together, and a bunch of us were in the pool messing around tossing the polo ball back and forth. Happened my Freshman year of HS, he was a senior, and it was 2 weeks from graduation. Broke 3-4 vertebrae and was permanently paralyzed from the shoulders down... Gives me the creeps whenever I see someone dive into a shallow end ever since.