Extract from: "Debretts Guide to Etiquette in the Underworld"

“Dining out in the underworld is a tricky business for the visitor, as the consumption of food or drink, even if unwittingly, will instantly make it difficult or impossible for the visitor to leave the host’s dwelling – an embarrassing situation all round! However, the rules governing behaviour are universal and a little charm goes a long way in dealing with what could otherwise be a tricky moment. Your host is honour bound to offer you sustenance, but if you decline, politely, but with grace and gentility, you should find this leads to minimal disturbance.”