Who at a high school could have guessed this random string of words might mean something else? A teacher?  (via WSB-TV)

Georgia senior Paris Gray is facing a possible ban from graduation activities because she coded the phrase "back that ass up" into her yearbook quote by listing elements from the periodic table. 

Apparently, none of the high school's faculty or yearbook staff noticed Gray was making a science joke with the message, "When the going gets tough just remember to Barium, Carbon, Potassium, Thorium, Astatine, Arsenic, Sulfur, Uranium, Phosphorus." Only now that the yearbook is out, this senior class vice president and school leader is facing penalties. She has already missed her graduation walk.

Sources: Gawker