At Bristol in the Nationwide Series race Keselowski was the center of controversy because he was involved in an accident caused by Kyle Busch. In turn 3 with 33 laps left, Busch slid in front of Keselowski, causing Keselowski to bump him. Busch was angry that Keselowski bumped him, so in the next turn Busch retaliated, by intentionally wrecking Keselowski into the wall. NASCAR did not penalize Busch because they had previously made a rule allowing drivers to police themselves called "Boys have at it." Keselowski finished in 14th instead of possibly contending for the race win. Kyle Busch ended up winning the race and admitted that wrecking Brad was on purpose in a post-race conference. In reply to the crash, Keselowski called Busch "an ass" during driver introductions before the Cup race. Both drivers were given a warning by NASCAR the next week and temporary placed on probation. In 2012, Keselowski and Kyle Busch announced that they ended their rivalry though they've had a few run-ins since (Such as when Keselowski and Busch made contact at Watkins Glen in 2012 and Busch crashing Keselowski at Kansas in 2013) that didn't boil over.