Just to add that Granny, despite her fading sight and already poor driving ( micro?) skillz had a habit of not reversing all the way into combat ( Tescos).
Said allegedly overpowered horn would have been useless as she wouldn't have seen the poor pedestrians she was about to run over as she couldn't look over her shoulder.
Of course she could actually have done some damage to pedestrians ( Ostruppen? ) by running them over. Though had she gone on a mad vehicular killing spree due to the price of stamps and length of queues in the post office I rather suspect forwards would have made more sense to the senile old bat.
