The 1904 marathon was marred by poor planning. The route was dusty and inadequately marked, leading to confusion.
The Munich Olympics were overshadowed by the tragic terrorist attack where 11 Israeli athletes were taken hostage and killed by the Palestinian group
In the men's all-around gymnastics final, scoring errors led to South Korean gymnast Yang Tae-young being unfairly denied a gold medal.
Eight female badminton players from China, South Korea, and Indonesia were disqualified for deliberately trying to lose matches to face easier opponents in the knockout stages.
The diving pool at the Rio Olympics turned a murky green due to a chemical imbalance.