Ham on Wry

ONE NIGHT, SHE HAD HAD A FEW too many in a roadhouse, but was driving home anyhow. Worse, it was in the middle of a fierce snowstorm. She grew more and more frantic, but then came up behind a snowplow. What luck! She just followed the machine, keeping as close as she could, letting it clear the way for her. At times, the heavy snowfall almost cut off her view, but the lights of her slow, steady guide kept on leading the way. At long last the plow stopped. Its driver got out, came back and asked her, "And what do you think you're doing?"