A father is very much concerned about his young son Billy’s bad grades in math. In desparation, he decides to register Billy at a catholic school. After his first term there, Billy brings home his report card. And, lo and behold, he’s getting A’s in math.
The father is, of course, pleased, but wants to know: “Why are your math grades suddenly so good?”
Billy’s face goes a little white, and he replies, “when I walked into the classroom the first day, and I saw that guy on the wall nailed to a plus sign, I knew one thing: this place means business!”