if he had a profession , when he was taking the bus home , it wouldnt be from his shitty little job which left his mind completely blank at the end of the day and thus prey to whatever perverse thoughts might be floating in the air , but he would be coming home from his professional job and his mind would be occupied with some detailed and difficult technical problem with which he had been confronted in the course of his work day ; and he probably wouldnt even notice the elderly nun sitting two seats in front of him ( or the smart ass sitting across the aisle for that matter ) ; or if he did notice the nun , any idea that popped into his head would probably be of a technical nature related to his highly technical profession .