Blond & her new BMW

A Rich Blonde Buys the New Automatic BMW X6 Sport.She drives the car perfectly well during the day, But at night it justwon't move at all.She tries driving the car at night for a week but still no luck.She then furiously calls the BMW dealers and they send out a technician to her, the technician asks: Maam, are you sure you are using the right gears??Full of anger Blonde replies: You fool, Idiot man, how you could asksuch a question, I'm not stupid!! I use D for the Day and N for the Night...