Koko, the famed gorilla whose mastery of sign language made her a celebrity, has now resorted to flipping everybody off. 'Apparently, after more than 20 years of rigorous sign-language training and cue-card drills, Koko is sick of being the world's foremost test ape,' said Koko trainer Dr. Francine Patterson. 'Yesterday, she gave me the hand sign for 'Leave me the hell alone, already. I am an intelligent creature who has more than adequately demonstrated my vast capacity for reasoning and other high-level brain functions. Go away, and let me eat my banana in peace.'' 