Monty Hall Brain Teaser

I love brain teasers.... If you have a good one, please email it to me (mehavecable@yahoo.ca).

Here's a fav that I sent out to a few of my friends last year...

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Monty Hall Puzzle
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You are on the game show - "Let's Make A Deal."

There are three doors: door number 1, door number 2, and door number 3.

Behind one door is a fabulous spanking new car. The other two doors contain smelly goats. You need to choose a door, and you get whatever is behind it. Monty Hall knows which door the new car is behind.

You choose a door. Monty Hall will now open up one of the other two doors you didn't choose, revealing a goat.

There are now two doors left, one that you chose originally and the other. One will contain the car, the other a goat.

Now Monty asks you a question - "Do you wish to switch doors, you can if you want?'

Question: What should you do? Is there a reason to switch doors?

I'll post the answer in a few days... Good luck!!