You're presented with three curtains. Curtain number one, curtain number two, and curtain number three. And you're told that behind one of these three curtains, there's a fabulous prize, something that you really want, a car or a vacation or some type of large amount of cash. And then behind the other two, and we don't know which they are, there is something that you do not want, a new pet goat or an ostrich or something like that, or a beach ball, something that is not as good as the cash prize. And so your goal is to try to find the cash prize. And they say, guess which one, or which one would you like to select? And so let's say that you select door number one, or curtain number one.