This is from 1982. Brazilian world champion Nelson Piquet and Eliseo Salazar go at it at the
German Grand Prix at the Hockenheimring after Salazar hits Piquet in the
Ostkurve chicane taking both of them out of the race. Interestingly, Piquet and Salazar were known as karate work out buddies before the fight. The entire incident is captured on tape and can be viewed at
Jalopnik.
