I propose a rules change to Olympic high diving: Once everyone has dived, and they'd normally be about to award the medals, the silver medalist should be allowed to risk it for the biscuit, and take a 20m dive for the gold. If the gold medalist wants to defend the gold, they have to take the risk, too. I propose this not as a show of athletic prowess, but for the entertainment value, and the tense TV moments that would be made into movies some day.