Bobby Allison, Cale Yarborough and Donnie Allison
Bobby Allison (left, in helmet) fights with Cale Yarborough (right) as Allison's brother, Donnie, swings his helmet at Yarborough after the 1979 Daytona 500. Donnie Allison was leading the race on the final lap when Yarborough spun both of them into the infield. They started fighting shortly thereafter, prompting Bobby Allison to pull over and join. The incident drew great publicity for NASCAR, with many considering the 1979 500 the most important race in stock car history.