The obvious answer is Haskell.

It is the only logical language that exists. Anyone who doesn't know it just hurting themselves.

After you master functional programming, you will be able to use it in EVERY other language.

You can even program ruby on rails functionally.

If anyway says anything negative about functional programming - they're just not dedicated or intelligent enough to understand its' abstract concepts.

In a world filled with hurt feelings and thin skin - finally seeing the logical essence of code is a transcendent experience.