15. Kurt and Kyle Busch
Hateful lowlight: Kyle was once suspended for purposely starting a car wreck
With nicknames like "Rowdy" and "Outlaw," the Busch brothers are famous for their tit-for-tat beefs with other drivers (and occasionally each other), which often involve spinning cars and forcing folks into the wall at 150 mph. When these two are racing, the odds of seeing a violent crash or hand-to-hand combat in the pit skyrocket.