Casey Mears, center, and Marcos Ambrose, right (pictured here during happier times), got into an altercation April 25 in Richmond, during which Ambrose punched Mears in the eye. "He got me pretty good with that shot," Mears told NASCAR.com the next day, sporting sunglasses to hide the badly bruised and swollen eye. Replays of the incident show Mears and Ambrose talking just after the race ended. The situation escalated when Mears forcefully shoved Ambrose. The driver of the No. 9 Ford then returned with a right hook to Mears' face. Here are some more of NASCAR'S memorable dustups and feuds.