Until last night, I had never experimented with the sortes Virgilianae. It's that do-it-yourself form of fortune-telling which involves opening a text of Virgil at random, plunging your finger in, and whatever phrase it lands on, that's your answer.
It's got a long and noble history going back to the Roman world itself (the emperor Hadrian is supposed to have done it, for example) and beyond. One of the most famous modern consulters was Charles I, who went to the Bodleian specially to consult a copy (didn't he actually have one in his palace, I can't help wondering) and got a predictably gloomy answer.
But it came in handy for ladies too. Mrs Thrale apparently resorted to Virgil when she was trying to decide whether to marry Mr Piozzi and decamp to Italy. Her finger came down on "O decus Italiae" (Aeneid 11, 508) ... "O jewel of Italy" -- and off she went! Mary Shelley was another keen consulter, but her copy seemed to have a nasty tendency to fall open at the Dido episode, which was hardly ever good news for poor Mary.
Anyway last night was my first go.