Who: The IOC
Olympics: Sydney 2000

When the world's best gymnasts are falling off the vault horse right and left, it probably isn't a coincidence. The vault was set five centimeters too low and the gymnasts struggled throughout the competition. Once the mistake was corrected, they were allowed to try again, but the damage was done for some competitors. Russian Svetlana Khorkina fell on the vault and then, with her confidence undoubtedly shaken, went to the uneven bars and fell once again.