Cold Feet

In the song "Baby, It's Cold Outside," a man tries to convince a woman (presumably his significant other) to spend the night at his house since it is so cold outside.  At first, the woman politely rejects.  Rather than give up, though, the man begins asking her for smaller things, such as if she would like "a half a drink more."  The woman accepts this request, and soon after, she also decides to stay for another cigarette.  All the while, the man is persistently reminding her of how cold it is outside.  At the end of the song, it is implied that the woman decides to spend the night, seeing as how they both agree that it is far too cold outside.  This is a perfect example of the foot-in-the-door phenomenon, or the "tendency for people who have first agreed to a small request to comply later with a larger request."  Similarly, Andy uses this technique in The Shawshank Redemption with what he requests from Red.  He starts by asking for a rock hammer, and slowly works his way up to a large poster of Rita Hayworth.  Both examples here are prime displays of this phenomenon at work.