A mathematician leaves a conference only to find that the last train has gone.
Being a devout Christian, he falls to his knees and prays: "God, if it lies within your will, please send me a way to get home tonight!".
To his astonishment, there is a swirl of ethereal music, and an angel descends from the clouds, and moments later a shiny black Audi appears where it wasn't before. "Hail, thou who has found favour with the Lord!" proclaims the angel. "Here is your way home" - and the angel hands …