When Dionysus the Renegade faked a Sophocles text in 400BC (cunningly inserting the acrostic 'Heraclides is ignorant of letters') to humiliate an academic rival, he paved the way for two millennia of increasingly outlandish literary hoaxers. The path from his mischievous stunt to more serious tricksters like the controversial memoirist and Oprah-duper James Frey, takes in every sort of writer: from the religious zealot to the bored student, via the vengeful academic and the out-and-out joker. But whether hoaxing for fame, money, politics or simple amusement, each perpetrator represents something unique about why we write.