From the ArcaMax Publishing, ArcaMax Publishing Newsletter:
http://www.arcamax.com/news/arcapub/s-565993-110961
Little Johnny was going to a public school and he was doing very badly
in maths. So his mother decided to put him into a Catholic school.
When she got his report card at the end of the term, his marks in
maths had improved tremendously.
So she asked him why. He replied "When I saw that guy nailed to the
plus sign, I knew they meant business!"