Piggy Banks

Let us suppose you were given 2 identical piggy banks and you know that one of them contains 10 times more money then the other. You can open only one and take the money. Assume that you choose the left one and you break it. Inside you find $100 note (the amount is not that important).

So, this means that in another piggy bank there is either $10 or $1000.
Then you are offered to change your opened piggy bank (with that $100) to the other one.
So, using this line of reasoning you are thinking:
If you’d be lucky, you will gain $900 ($1000-$100), if not – you will lose $90 ($100-$10). The loosing sum is 10 times less then winnings and the possibility to win is 50%. So, you should agree to the change.
But then it means you should have been chosen the other piggy bank from the very beginning. But that is totally ludicrous because piggy banks are 100% equal!

The consequence is:
Let us suppose you’re the young belle girl who was proposed to marry by 2 princes, both in white limousines. And you very very much want to marry.

But whoever you decide to choose between the two, you will be wrong – you should have been marrying the other prince.