A friend of mine ran up the back of a car he was following through a round about when it suddenly slammed on the brakes.
The woman got out and explained that she had accidentally gone to change gears in the car (borrowed from a friend) and forgot it was an automatic (normally drives a manual) and had slammed the brake pedal to the floor thinking it was the clutch.
My mate had no chance and slammed in to the rear of her. He was found to be at fault and she was found to not be at fault.
Personally I think she should have been charged with negligent driving.
Yeh the way they'll look at that though is that he should have been driving at a "safe" distance.