We know that elephants are smart animals, but this particular one is a bit too smart. Graduate student Joshua Plotnik of Emory University recently recorded the result of an elephant intelligence test in which one elephant was caught "cheating."
Robert Krulwich of Krulwich Wonders blog over at NPR explains how: http://www.npr.org/blogs/krulwich/2011/03/16/134540633/gotcha-elephant-caught-cheating | Article about the experiment over at New Scientist