A Cup of Cold

This experiment comes from some research I am doing on "Science With Your Refrigerator," but it has its roots in my childhood. You may recognize some of your childhood too.

OK, picture this scene. You are a hungry teenager. There is a refrigerator full of food in front of you. You open the door and then start looking around for something that looks good to eat. As you stand there, trying to decide what to devour, a voice from behind you mentions that your family cannot afford to refrigerate the entire neighborhood and asks you to close the door until you know what you want. What really happens when you open the refrigerator door?