I suspect there were a lot of those bumps when Hillary was in the car.
Within the White House, Hillary had a “standing rule that no one spoke to her when she was going from one location to another,” says former FBI agent Coy Copeland. “In fact, anyone who would see her coming would just step into the first available office.”
One former Secret Service agent states, “If Hillary was walking down a hall, you were supposed to hide behind drapes used as partitions.” .... http://www.frontpagemag.com