Clap clap clap...And here you are... in the final stage of the most popular quiz in the world: "Where is the key?" (I made up the name in 5 seconds).Ok, here is the situation. You have beaten all other contenders. Now they put 3 boxes in the front of you. One of them contain a dream vehicle's key that you always wanted. The other two is empty. Here's the deal: If you can guess which box contain the...