Looking back…

Usain Bolt disqualifies from the 100m Mens final race in the World championships because of a starting block error. Daegu, South Korea. 28th August 2011. 2011 IAAF World Championships.
DAEGU, SOUTH KOREA – AUGUST 28: Usain Bolt of Jamaica disqualifies from the 100m Mens final race because of a starting block error during the 2011 IAAF World Championships at the Daegu Stadium on August 28, 2011 in Daegu, South Korea. (Photo by Angelos Zymaras)