Bernie the Gorilla

Once upon a time there was a gorilla called Bernie who knew sign language. He'd been specially trained since birth and now, at the age of 8, he knew over 400 signs. There was even an article about him in National Geographic. He was a miracle of science, people said. The zoo charged visitors lots of money to look at him, and they paid it, because they'd heard that he was really quite something. But afterwards,some of them would ask for their money back, because when people signed to him, he'd sign back saying 'F**k off, you deaf prick.'