The secret behind a good Catholic education

I've actually heard this one before, but I post it here for all my fellow Catholic school survivors: 
     Little Zachary was doing badly in math. His parents tried everything...tutors, mentors, flash cards, special learning centers.  Finally, in a last ditch effort, they took Zachary down and enrolled him In the local Catholic school.
     After the first day, little Zachary came home. He didn't even kiss his mother hello. Instead, he went straight to his room and started studying.  Books and papers were spread out all over the room and Zachary was hard at work. His mother was amazed. She called him down to dinner. To her shock, the minute he was done, he marched back to his room without a word, and in no time, he was back hitting the books as hard as before. 
     This went on day after day. 
     Finally, little Zachary brought home his report Card. With great trepidation, His Mom looked at it and to her great surprise, Little Zachary got an 'A' in math. She could no longer hold her curiosity.. She went to his room and said, 'Son, what was it? Was it the nuns?' Little Zachary shook his head, no.. 'Well, then,' Was it the books, the discipline, the structure? 
    WHAT WAS IT?'  
    Little Zachary looked at her and said, 'Well, on the first day of school when I saw that guy nailed to the plus sign, I knew they weren't fooling around.'