Little Johnny had terrible grades in school. So his parents
 decided to send him to a different school.
 
 The same thing happened at this school - bad grades. They sent him
 to several different schools and still bad grades. So, as a last
 resort, they decided to send him to a Catholic school.
 
 The first day, Johnny came home, rushed up to his room, and did his
 homework. This went on every day until his report card came out.
 He had straight A's, his parents were so proud, but they asked
 him, "Johnny, why after sending you to all these different
 schools, you fail, then we send you to the Catholic school and you
 have straight A's?" 
 
 Johnny replied, "Well, the first day, when I walked in, I looked
 up and saw that guy nailed to that plus sign, I knew they meant
 business."