Listening To The Sphinx

Came across a very neat painting the other day, 'Listening To The Sphinx' by Elihu Vedder. It was said years ago the sand was piled high enough around the Sphinx of Giza that people could approach the mouth and listen for 'whispered answers' to their question, just as it is shown in the painting. What kind of questions would you ask a sphinx, what answers would you receive?