>>Monty hall shows you three doors and asks you to select a door.
>>You know behind one of the doors is a brand new car.
>>Behind two of the doors are goats.
>>After you select the door he shows you whats a goat behind one of the doors.
>>You are then asked if you should switch doors.
>>
>>What should you do?
>
>It is actually a very interesting (and well-known) question. I know the answer, but I won't say :)

Then you know that the correct answer is to switch.