Can you clarify which hoax you are referring to? If you mean the boarding of HMS Dreadnought by a party of British men and women (including Virginia Woolf) who purported to be Abyssinian [Ethiopian] princes, and who had dressed in theatrical costumes and applied blackface – in which the Dreadnought's band, unable to find sheet music for the Abyssinian national anthem, played the Zanzibarian one instead – I can expand on that for you. Otherwise, I'm sorry to say I'm not sure what hoax you actually mean.