I was trying to remember this problem but I just can't seem to remember the name. It went something like this:
>Mary was a famous artist, she is succesful and happy.
>What's more likely?
>She is talented.
>She is talented and of upper class.
The paradox is counter intuitive because people often think the right answer is the second one, but as the second option is a SUBSET of the first set, the right answer is the first.
Also post favourite problem and paradoxes.