Achar Singh buys the new Automatic BMW X8 sport.

He drives the Car perfectly well during the day, but at night the Car just won’t move at all.
He tries driving the car at night for a week but still no luck.
He then furiously calls the BMW dealers and they send out a technician to him, the technician asks “ Sir, are you sure you are using the right gears?”
Full of anger Achar replies “You fool, idiot man, how you could ask such a question, I'm not stupid!! I use D for the Day and N for the Night...”