Ask Voldemort questions. Questions you can ask are: What's your name? What happened to your nose? Do you have a secret crush on Bellatrix? Why are you bald? Why don't you like Harry Potter? Why do you wear black? Are you wearing makeup? Why such a dedication to evil? Why do you like killing people? How good are you at magic?
Thanks Sherlock13 for giving Caitlin91 the idea and thanks Caitlin91 for giving me the idea to add a part to the last question.