One of the most interesting debates I had recently with a family member concerned our interpretations of the statement that "the prophet will never lead the Church astray."
"I think your driving-the-car metaphor can help us with the meaning of 'astray' (which, as far as I know, has never been officially or adequately defined):
God will not let the car be driven into a ditch. He would remove the driver first.
But that doesn’t mean that the prophet can’t drive a longer-than-necessary route, take a detour, or swerve so hard I throw up out the window, etc.
I can rest assured that I should be in the car, but not that I will enjoy the ride. :)"