The Peñarol vs Nacional derby is the most important game in Uruguay and one of the fiercest rivalries in World football. On 26 November 2000 the two sides met in the Clausura championship, Nacional needed to win the game to damage Peñarol,s chances of becoming champions, Nacional took the lead but after Peñarol equalised the game degenerated into a brawl.
The game eventually finished 1-1, and Peñarol won the championship.
The two teams have a history of fighting, the 1990 derby game also degenerated into a brawl.
For more crazy South American football check out the rest of the Cosas locas series.