>You have selected door # 1 of three doors on the price is right.
>Monty Hall shows you door # 2. Behind door # 2 is a got chewing on an old tin can. Behind one of the two door is another got and behind the other is a new boat.
>
>Monty Hall asks you if you want to change the door you have chosen. Should you change? And why?

It's irrelevant whether you'd change or not - the chances of the boat being behind the #1 or #3 are 50:50.