A blonde buys a car. She drives it home then goes to bed. The next morning she goes to work. After working all day she leaves at eleven o clock at night. She gets inside her car starts it up, but the car won't go she calls a mechanic and he tows the car to his garage and looks at it and says there is nothing wrong with the car. He asks if she knows hot to shift properly and she said of course! I use D for day and N for night!