Programming language hipsterness

What's a language that is really unpopular but you quite like. For me, it's J. Some of the idioms in J are a little annoying at first and the learning curve is pretty steep, but once you can read it quickly, you can see the whole program at once.

I like bonercoe. Some of the idioms in bonercode are a little annoying at first and the learning curve is pretty shallow, and once you can read it quickly, you can see the whole program at once.