Explanation:
When a person needs a favor from another person, he uses the Foot in the door technique usually.
The foot in the door phenomenon is a technique in which a person ask for a small favor from a person at the first, and then go for asking the bigger favor later. The most simple example of this phenomenon is the lending of money from a person by asking him to lend you small amount of money at the first time and then asking for lending big amount after that.
In this question, if you want to get your friend's car for the night, you would probably ask her to give you lift before asking her to lend you her car. Ask her to drop you by your house, and then on the way to your house, ask her to lend you car for tonight. This is how foot in the door phenomenon works.
