The quote reads, “When the going gets tough just remember to Barium, Carbon, Potassium, Thorium, Astatine, Arsenic, Sulfur, Uranium, Phosphorus.” School administrators learned Friday that by using the abbreviations for the elements from the periodic table, the quote spelled, “To back that as$ up."
http://www.wkrn.com/story/25561339/g...yearbook-quote
Let the kid graduate. The editors, and publishers, let it go. It probably didn't get noticed until all the kids started buzzing about it. Just make sure you look over the material, before you print it next time.