A Jewish boy comes home with his report card. His parents take a look and see: English: A Science: A History: A Math: F They tell him he's grounded until they see improvement, but when the next report card comes he gets an F in math yet again! After thinking hard about what to do this time, they decide they must send him to Catholic school. After just one term at Catholic school he comes home with an A in Math! The father asks, ""Son, what made this time so different?"" He replies, ""Well when I saw that kid nailed to the plus sign I knew they meant business!""